Fix MR diff comments. Fix wiki comments loading error

app/models/project.rb

@@ -171,6 +171,10 @@ class Project < ActiveRecord::Base
     end
   end
 
+  def wiki_notes
+    Note.where(noteable_id: wikis.map(&:id), noteable_type: 'Wiki', project_id: self.id)
+  end
+
   def project_id
     self.id
   end

app/models/wiki.rb

@@ -28,7 +28,6 @@ class Wiki < ActiveRecord::Base
       end
       new_wiki
     end
-
   end
 end
 # == Schema Information