diff --git a/app/views/admin/background_jobs/show.html.haml b/app/views/admin/background_jobs/show.html.haml
index 654d261aa99..4f680b507c4 100644
--- a/app/views/admin/background_jobs/show.html.haml
+++ b/app/views/admin/background_jobs/show.html.haml
@@ -2,7 +2,7 @@
 - page_title "Background Jobs"
 = render 'admin/background_jobs/head'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   %h3.page-title Background Jobs
   %p.light GitLab uses #{link_to "sidekiq", "http://sidekiq.org/"} library for async job processing
 
diff --git a/app/views/admin/builds/index.html.haml b/app/views/admin/builds/index.html.haml
index efd5b12cfeb..1e60205f91a 100644
--- a/app/views/admin/builds/index.html.haml
+++ b/app/views/admin/builds/index.html.haml
@@ -1,7 +1,7 @@
 - @no_container = true
 = render "admin/dashboard/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
 
   .top-area
     %ul.nav-links
diff --git a/app/views/admin/dashboard/index.html.haml b/app/views/admin/dashboard/index.html.haml
index 4682016a886..a2ac407c159 100644
--- a/app/views/admin/dashboard/index.html.haml
+++ b/app/views/admin/dashboard/index.html.haml
@@ -1,7 +1,7 @@
 - @no_container = true
 = render "admin/dashboard/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .admin-dashboard.prepend-top-default
     .row
       .col-md-4
diff --git a/app/views/admin/groups/index.html.haml b/app/views/admin/groups/index.html.haml
index 4f1996ef7ab..94aa5f5a942 100644
--- a/app/views/admin/groups/index.html.haml
+++ b/app/views/admin/groups/index.html.haml
@@ -2,7 +2,7 @@
 - page_title "Groups"
 = render "admin/dashboard/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   %h3.page-title
     Groups (#{number_with_delimiter(@groups.total_count)})
 
@@ -39,7 +39,6 @@
       = link_to 'New Group', new_admin_group_path, class: "btn btn-new"
 
   %ul.content-list
-    - @groups.each do |group|
-      = render 'group', group: group
+    = render @groups
 
   = paginate @groups, theme: "gitlab"
diff --git a/app/views/admin/health_check/show.html.haml b/app/views/admin/health_check/show.html.haml
index 7b8407f9152..e79303240f0 100644
--- a/app/views/admin/health_check/show.html.haml
+++ b/app/views/admin/health_check/show.html.haml
@@ -2,7 +2,7 @@
 - page_title "Health Check"
 = render 'admin/background_jobs/head'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   %h3.page-title
     Health Check
   .bs-callout.clearfix
diff --git a/app/views/admin/logs/show.html.haml b/app/views/admin/logs/show.html.haml
index 5ddc3b9ea85..676812121d7 100644
--- a/app/views/admin/logs/show.html.haml
+++ b/app/views/admin/logs/show.html.haml
@@ -5,7 +5,7 @@
              Gitlab::RepositoryCheckLogger]
 = render 'admin/background_jobs/head'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   %ul.nav-links.log-tabs
     - loggers.each do |klass|
       %li{ class: (klass == Gitlab::GitLogger ? 'active' : '') }
diff --git a/app/views/admin/projects/index.html.haml b/app/views/admin/projects/index.html.haml
index 4822cb693c2..7d2eb423223 100644
--- a/app/views/admin/projects/index.html.haml
+++ b/app/views/admin/projects/index.html.haml
@@ -3,7 +3,7 @@
 = render 'shared/show_aside'
 = render "admin/dashboard/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .row.prepend-top-default
     %aside.col-md-3
       .panel.admin-filter
diff --git a/app/views/admin/runners/index.html.haml b/app/views/admin/runners/index.html.haml
index 5eff77aff2d..114bea92fc2 100644
--- a/app/views/admin/runners/index.html.haml
+++ b/app/views/admin/runners/index.html.haml
@@ -1,7 +1,7 @@
 - @no_container = true
 = render "admin/dashboard/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
 
   %p.prepend-top-default
     %span
diff --git a/app/views/admin/system_info/show.html.haml b/app/views/admin/system_info/show.html.haml
index 3ef2f20b589..247db295863 100644
--- a/app/views/admin/system_info/show.html.haml
+++ b/app/views/admin/system_info/show.html.haml
@@ -2,7 +2,7 @@
 - page_title "System Info"
 = render 'admin/background_jobs/head'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .prepend-top-default
   .row
     .col-sm-4
diff --git a/app/views/admin/users/index.html.haml b/app/views/admin/users/index.html.haml
index d0a696da64b..21bb99a792c 100644
--- a/app/views/admin/users/index.html.haml
+++ b/app/views/admin/users/index.html.haml
@@ -3,7 +3,7 @@
 = render 'shared/show_aside'
 = render "admin/dashboard/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .admin-filter
     %ul.nav-links
       %li{class: "#{'active' unless params[:filter]}"}
diff --git a/app/views/groups/show.html.haml b/app/views/groups/show.html.haml
index a0a6762edcf..69f634e75b9 100644
--- a/app/views/groups/show.html.haml
+++ b/app/views/groups/show.html.haml
@@ -5,7 +5,7 @@
     = auto_discovery_link_tag(:atom, group_url(@group, format: :atom, private_token: current_user.private_token), title: "#{@group.name} activity")
 
 .cover-block.groups-cover-block
-  %div{ class: (container_class) }
+  %div{ class: container_class }
     = link_to group_icon(@group), target: '_blank' do
       = image_tag group_icon(@group), class: "avatar group-avatar s70"
     .group-info
diff --git a/app/views/projects/_home_panel.html.haml b/app/views/projects/_home_panel.html.haml
index 86ea08dd229..8ce23379fb4 100644
--- a/app/views/projects/_home_panel.html.haml
+++ b/app/views/projects/_home_panel.html.haml
@@ -1,6 +1,6 @@
 - empty_repo = @project.empty_repo?
 .project-home-panel.cover-block.clearfix{:class => ("empty-project" if empty_repo)}
-  %div{ class: (container_class) }
+  %div{ class: container_class }
     .row
       .project-image-container
         = project_icon(@project, alt: '', class: 'project-avatar avatar s70')
diff --git a/app/views/projects/_last_push.html.haml b/app/views/projects/_last_push.html.haml
index e0ca2a3109c..434d8644b83 100644
--- a/app/views/projects/_last_push.html.haml
+++ b/app/views/projects/_last_push.html.haml
@@ -1,7 +1,7 @@
 - if event = last_push_event
   - if show_last_push_widget?(event)
     .row-content-block.top-block.clear-block.hidden-xs
-      %div{ class: (container_class) }
+      %div{ class: container_class }
         .event-last-push
           .event-last-push-text
             %span You pushed to
diff --git a/app/views/projects/blob/show.html.haml b/app/views/projects/blob/show.html.haml
index 8d77bdbe382..0ab78a39cf9 100644
--- a/app/views/projects/blob/show.html.haml
+++ b/app/views/projects/blob/show.html.haml
@@ -2,7 +2,7 @@
 - page_title @blob.path, @ref
 = render "projects/commits/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   = render 'projects/last_push'
 
   %div#tree-holder.tree-holder
diff --git a/app/views/projects/branches/index.html.haml b/app/views/projects/branches/index.html.haml
index e0367c40272..77b405f1f39 100644
--- a/app/views/projects/branches/index.html.haml
+++ b/app/views/projects/branches/index.html.haml
@@ -2,7 +2,7 @@
 - page_title "Branches"
 = render "projects/commits/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     .nav-text
       Protected branches can be managed in project settings
@@ -27,7 +27,7 @@
                 = sort_title_recently_updated
               = link_to namespace_project_branches_path(sort: 'last_updated') do
                 = sort_title_oldest_updated
-  - unless @branches.empty?
+  - if @branches.any?
     %ul.content-list.all-branches
       - @branches.each do |branch|
         = render "projects/branches/branch", branch: branch
diff --git a/app/views/projects/builds/index.html.haml b/app/views/projects/builds/index.html.haml
index 181547316aa..a131289ee97 100644
--- a/app/views/projects/builds/index.html.haml
+++ b/app/views/projects/builds/index.html.haml
@@ -2,7 +2,7 @@
 - page_title "Builds"
 = render "projects/pipelines/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     %ul.nav-links
       %li{class: ('active' if @scope.nil?)}
diff --git a/app/views/projects/commits/show.html.haml b/app/views/projects/commits/show.html.haml
index 51ca4eb903e..9a44ba94970 100644
--- a/app/views/projects/commits/show.html.haml
+++ b/app/views/projects/commits/show.html.haml
@@ -7,7 +7,7 @@
 
 = render "head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .row-content-block.second-block.content-component-block
     .tree-ref-holder
       = render 'shared/ref_switcher', destination: 'commits'
diff --git a/app/views/projects/compare/index.html.haml b/app/views/projects/compare/index.html.haml
index b22285c11e0..e9ff8e90dd5 100644
--- a/app/views/projects/compare/index.html.haml
+++ b/app/views/projects/compare/index.html.haml
@@ -2,7 +2,7 @@
 - page_title "Compare"
 = render "projects/commits/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .sub-header-block
     Compare branches, tags or commit ranges.
     %br
diff --git a/app/views/projects/compare/show.html.haml b/app/views/projects/compare/show.html.haml
index f4ec7b767f6..28a50e7031a 100644
--- a/app/views/projects/compare/show.html.haml
+++ b/app/views/projects/compare/show.html.haml
@@ -2,7 +2,7 @@
 - page_title "#{params[:from]}...#{params[:to]}"
 = render "projects/commits/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .sub-header-block.no-bottom-space
     = render "form"
 
diff --git a/app/views/projects/environments/index.html.haml b/app/views/projects/environments/index.html.haml
index a03f117291f..5242021243e 100644
--- a/app/views/projects/environments/index.html.haml
+++ b/app/views/projects/environments/index.html.haml
@@ -2,7 +2,7 @@
 - page_title "Environments"
 = render "projects/pipelines/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   - if can?(current_user, :create_environment, @project) && !@environments.blank?
     .top-area
       .nav-controls
diff --git a/app/views/projects/environments/show.html.haml b/app/views/projects/environments/show.html.haml
index 4c15e2759d6..53c62ef234d 100644
--- a/app/views/projects/environments/show.html.haml
+++ b/app/views/projects/environments/show.html.haml
@@ -2,7 +2,7 @@
 - page_title "Environments"
 = render "projects/pipelines/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     .col-md-9
       %h3.page-title= @environment.name.titleize
diff --git a/app/views/projects/graphs/ci.html.haml b/app/views/projects/graphs/ci.html.haml
index e695d3ae369..6be4273b6ab 100644
--- a/app/views/projects/graphs/ci.html.haml
+++ b/app/views/projects/graphs/ci.html.haml
@@ -2,7 +2,7 @@
 - page_title "Continuous Integration", "Graphs"
 = render 'head'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .sub-header-block
     .oneline
       A collection of graphs for Continuous Integration
diff --git a/app/views/projects/graphs/commits.html.haml b/app/views/projects/graphs/commits.html.haml
index 0daffe68f6f..65db8af494d 100644
--- a/app/views/projects/graphs/commits.html.haml
+++ b/app/views/projects/graphs/commits.html.haml
@@ -2,7 +2,7 @@
 - page_title "Commits", "Graphs"
 = render 'head'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .sub-header-block
     .tree-ref-holder
       = render 'shared/ref_switcher', destination: 'graphs_commits'
diff --git a/app/views/projects/graphs/languages.html.haml b/app/views/projects/graphs/languages.html.haml
index 6d97f552a8e..fcfcae0be20 100644
--- a/app/views/projects/graphs/languages.html.haml
+++ b/app/views/projects/graphs/languages.html.haml
@@ -2,7 +2,7 @@
 - page_title "Languages", "Graphs"
 = render 'head'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .sub-header-block
     .oneline
       Programming languages used in this repository
diff --git a/app/views/projects/graphs/show.html.haml b/app/views/projects/graphs/show.html.haml
index 9f7e2a361ff..a985b442b2d 100644
--- a/app/views/projects/graphs/show.html.haml
+++ b/app/views/projects/graphs/show.html.haml
@@ -2,7 +2,7 @@
 - page_title "Contributors", "Graphs"
 = render 'head'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .sub-header-block
     .tree-ref-holder
       = render 'shared/ref_switcher', destination: 'graphs'
diff --git a/app/views/projects/issues/index.html.haml b/app/views/projects/issues/index.html.haml
index cd876b5ea62..7ce4c1e5555 100644
--- a/app/views/projects/issues/index.html.haml
+++ b/app/views/projects/issues/index.html.haml
@@ -6,7 +6,7 @@
   - if current_user
     = auto_discovery_link_tag(:atom, namespace_project_issues_url(@project.namespace, @project, :atom, private_token: current_user.private_token), title: "#{@project.name} issues")
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     = render 'shared/issuable/nav', type: :issues
     .nav-controls
diff --git a/app/views/projects/labels/index.html.haml b/app/views/projects/labels/index.html.haml
index aa4d69550ec..db66a0edbd8 100644
--- a/app/views/projects/labels/index.html.haml
+++ b/app/views/projects/labels/index.html.haml
@@ -3,7 +3,7 @@
 - hide_class = ''
 = render "projects/issues/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area.adjust
     .nav-text
       Labels can be applied to issues and merge requests. Star a label to make it a priority label. Order the prioritized labels to change their relative priority, by dragging.
diff --git a/app/views/projects/merge_requests/index.html.haml b/app/views/projects/merge_requests/index.html.haml
index 9f948d41dda..ace275c689b 100644
--- a/app/views/projects/merge_requests/index.html.haml
+++ b/app/views/projects/merge_requests/index.html.haml
@@ -3,7 +3,7 @@
 = render "projects/issues/head"
 = render 'projects/last_push'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     = render 'shared/issuable/nav', type: :merge_requests
     .nav-controls
diff --git a/app/views/projects/milestones/index.html.haml b/app/views/projects/milestones/index.html.haml
index b0e0bdfff5a..ad2bfbec915 100644
--- a/app/views/projects/milestones/index.html.haml
+++ b/app/views/projects/milestones/index.html.haml
@@ -2,7 +2,7 @@
 - page_title "Milestones"
 = render "projects/issues/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     = render 'shared/milestones_filter'
 
diff --git a/app/views/projects/network/_head.html.haml b/app/views/projects/network/_head.html.haml
index 86295a3d011..8f6805268d5 100644
--- a/app/views/projects/network/_head.html.haml
+++ b/app/views/projects/network/_head.html.haml
@@ -1,6 +1,6 @@
 - @no_container = true
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .row-content-block.second-block.content-component-block
     .tree-ref-holder
       = render partial: 'shared/ref_switcher', locals: {destination: 'graph'}
diff --git a/app/views/projects/network/show.html.haml b/app/views/projects/network/show.html.haml
index 3ca30b4ba6b..091af4df4a1 100644
--- a/app/views/projects/network/show.html.haml
+++ b/app/views/projects/network/show.html.haml
@@ -4,7 +4,7 @@
   = page_specific_javascript_tag('network/application.js')
 = render "projects/commits/head"
 = render "head"
-%div{ class: (container_class) }
+%div{ class: container_class }
   .project-network
     .controls
       = form_tag namespace_project_network_path(@project.namespace, @project, @id), method: :get, class: 'form-inline network-form' do |f|
diff --git a/app/views/projects/pipelines/index.html.haml b/app/views/projects/pipelines/index.html.haml
index b70693eeb62..28b475d5c2f 100644
--- a/app/views/projects/pipelines/index.html.haml
+++ b/app/views/projects/pipelines/index.html.haml
@@ -2,7 +2,7 @@
 - page_title "Pipelines"
 = render "projects/pipelines/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     %ul.nav-links
       %li{class: ('active' if @scope.nil?)}
diff --git a/app/views/projects/show.html.haml b/app/views/projects/show.html.haml
index 15f0d85194b..f6e81af2638 100644
--- a/app/views/projects/show.html.haml
+++ b/app/views/projects/show.html.haml
@@ -13,7 +13,7 @@
 = render "home_panel"
 
 .project-stats.row-content-block.second-block
-  %div{ class: (container_class) }
+  %div{ class: container_class }
     %ul.nav
       %li
         = link_to project_files_path(@project) do
diff --git a/app/views/projects/tags/index.html.haml b/app/views/projects/tags/index.html.haml
index 4ca1f58ac5c..c375bb6dd1b 100644
--- a/app/views/projects/tags/index.html.haml
+++ b/app/views/projects/tags/index.html.haml
@@ -2,7 +2,7 @@
 - page_title "Tags"
 = render "projects/commits/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     .nav-text
       Tags give the ability to mark specific points in history as being important
@@ -25,7 +25,7 @@
                 = sort_title_oldest_updated
 
   .tags
-    - unless @tags.empty?
+    - if @tags.any?
       %ul.content-list
         = render partial: 'tag', collection: @tags
 
diff --git a/app/views/projects/tree/show.html.haml b/app/views/projects/tree/show.html.haml
index 2abcfcdd7b2..bf5360b4dee 100644
--- a/app/views/projects/tree/show.html.haml
+++ b/app/views/projects/tree/show.html.haml
@@ -7,7 +7,7 @@
 = render 'projects/last_push'
 = render "projects/commits/head"
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .tree-controls
     = render 'projects/find_file_link'
     - if can? current_user, :download_code, @project
diff --git a/app/views/projects/wikis/_new.html.haml b/app/views/projects/wikis/_new.html.haml
index 4f8abcdc8e1..c32cb122c26 100644
--- a/app/views/projects/wikis/_new.html.haml
+++ b/app/views/projects/wikis/_new.html.haml
@@ -1,6 +1,6 @@
 - @no_container = true
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   %div#modal-new-wiki.modal
     .modal-dialog
       .modal-content
diff --git a/app/views/projects/wikis/edit.html.haml b/app/views/projects/wikis/edit.html.haml
index 817bf9b3f69..233538bb488 100644
--- a/app/views/projects/wikis/edit.html.haml
+++ b/app/views/projects/wikis/edit.html.haml
@@ -2,7 +2,7 @@
 - page_title "Edit", @page.title.capitalize, "Wiki"
 = render 'nav'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     .nav-text
       %strong
diff --git a/app/views/projects/wikis/git_access.html.haml b/app/views/projects/wikis/git_access.html.haml
index 6caf7230f35..b8811a28dd6 100644
--- a/app/views/projects/wikis/git_access.html.haml
+++ b/app/views/projects/wikis/git_access.html.haml
@@ -2,7 +2,7 @@
 - page_title "Git Access", "Wiki"
 
 = render 'nav'
-%div{ class: (container_class) }
+%div{ class: container_class }
   .sub-header-block
     %span.oneline
       Git access for
diff --git a/app/views/projects/wikis/history.html.haml b/app/views/projects/wikis/history.html.haml
index 630ee35b70b..4c0b14e2c42 100644
--- a/app/views/projects/wikis/history.html.haml
+++ b/app/views/projects/wikis/history.html.haml
@@ -1,6 +1,6 @@
 - page_title "History", @page.title.capitalize, "Wiki"
 = render 'nav'
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     .nav-text
       %strong
diff --git a/app/views/projects/wikis/pages.html.haml b/app/views/projects/wikis/pages.html.haml
index 81d9f391c1c..9c10acd4cb6 100644
--- a/app/views/projects/wikis/pages.html.haml
+++ b/app/views/projects/wikis/pages.html.haml
@@ -3,7 +3,7 @@
 
 = render 'nav'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   %ul.content-list
     - @wiki_pages.each do |wiki_page|
       %li
diff --git a/app/views/projects/wikis/show.html.haml b/app/views/projects/wikis/show.html.haml
index 76f9b1ecd76..5cebb538cf5 100644
--- a/app/views/projects/wikis/show.html.haml
+++ b/app/views/projects/wikis/show.html.haml
@@ -2,7 +2,7 @@
 - page_title @page.title.capitalize, "Wiki"
 = render 'nav'
 
-%div{ class: (container_class) }
+%div{ class: container_class }
   .top-area
     .nav-text
       %strong= @page.title.capitalize