Small clean up.

lib/simple_form.rb

@@ -117,11 +117,7 @@ module SimpleForm
 
   # Retrieves a given wrapper
   def self.wrapper(name)
-    if wrapper = @@wrappers[name.to_sym]
-      wrapper
-    else
-      raise WrapperNotFound, "Couldn't find wrapper with name #{name}"
-    end
+    @@wrappers[name.to_sym] or raise WrapperNotFound, "Couldn't find wrapper with name #{name}"
   end
 
   # Raised when fails to find a given wrapper name

test/form_builder/wrapper_test.rb

@@ -118,7 +118,6 @@ class WrapperTest < ActionView::TestCase
       with_form_for @user, :name, :wrapper => "another"
       assert_select "section.custom_wrapper div.another_wrapper label"
       assert_select "section.custom_wrapper div.another_wrapper input.string"
-      output_buffer.replace ""
     end
   end