Merge branch '13453_minimal_atom_fix' into 'master'

Added a content field to atom feed

See merge request gitlab-org/gitlab-ce!27652

app/views/issues/_issue.atom.builder

@@ -12,6 +12,7 @@ xml.entry do
 
   xml.summary issue.title
   xml.description issue.description if issue.description
+  xml.content issue.description if issue.description
   xml.milestone issue.milestone.title if issue.milestone
   xml.due_date issue.due_date if issue.due_date
 

changelogs/unreleased/13453_minimal_atom_fix.yml

+---
+title: Added a content field to atom feed
+merge_request: 27652
+author:
+type: fixed