CYB-301 Comments are being created, but not shown on gallery detail view

  * stray (misplaced) 'end' line in CommentsController#index, meant that the 'else' clauses where a record did not get persisted, in fact, was always executed.

This should fix the back-end issue (hopefully), and perhaps the front-end as well (if it was depending on a :created (201) return).