Wait for DOM ready to init merge request js.

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

@@ -108,8 +108,8 @@
   = render "projects/commit/change", type: 'cherry-pick', commit: @merge_request.merge_commit, title: @merge_request.title
 
 :javascript
-  var merge_request;
-
-  merge_request = new MergeRequest({
-    action: "#{controller.action_name}"
+  $(function () {
+    new MergeRequest({
+      action: "#{controller.action_name}"
+    });
   });