Add empty IssueCommonality module; include in Issue and MergeRequest

app/models/issue.rb

@@ -1,4 +1,5 @@
 class Issue < ActiveRecord::Base
+  include IssueCommonality
   include Upvote
 
   acts_as_taggable_on :labels

app/models/merge_request.rb

@@ -1,6 +1,7 @@
 require File.join(Rails.root, "app/models/commit")
 
 class MergeRequest < ActiveRecord::Base
+  include IssueCommonality
   include Upvote
 
   BROKEN_DIFF = "--broken-diff"

app/roles/issue_commonality.rb

@@ -0,0 +1,3 @@
+# Contains common functionality shared between Issues and MergeRequests
+module IssueCommonality
+end