Also show Revert and Cherry-pick when the source branch can't be removed

app/views/projects/merge_requests/widget/_merged.html.haml

@@ -44,3 +44,8 @@
             $('.remove_source_branch_in_progress').hide();
             $('.remove_source_branch_widget.failed').show();
           });
+      - else
+        %p
+          The changes were merged into
+          #{link_to @merge_request.target_branch, namespace_project_commits_path(@project.namespace, @project, @merge_request.target_branch), class: "label-branch"}.
+        = render 'projects/merge_requests/widget/merged_buttons'