Backporting little groups_helper refactor from gitlab-org/gitlab-ee!904

app/helpers/groups_helper.rb

@@ -8,11 +8,7 @@ module GroupsHelper
       group = Group.find_by(path: group)
     end
-    if group && group.avatar.present?
-      group.avatar.url
-    else
-      image_path('no_group_avatar.png')
-    end
+    group.try(:avatar_url) || image_path('no_group_avatar.png')
   end
   def group_title(group, name = nil, url = nil)