Use multi-line conditions in view, feedback:

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7034#note_17522557

app/views/projects/merge_requests/branch_from.html.haml

-= commit_to_html(@commit, @ref, @source_project) if @commit
+- if @commit
+  = commit_to_html(@commit, @ref, @source_project)