Make sure MR refresh service correctly determines newly added commits.

app/services/merge_requests/refresh_service.rb

@@ -8,6 +8,8 @@ module MergeRequests
       @fork_merge_requests = @project.fork_merge_requests.opened
       @commits = []
       
+      reload_merge_requests
+
       # Leave a system note if a branch were deleted/added
       if Gitlab::Git.blank_ref?(oldrev) || Gitlab::Git.blank_ref?(newrev)
         comment_mr_branch_presence_changed
@@ -18,7 +20,6 @@ module MergeRequests
         close_merge_requests
       end
 
-      reload_merge_requests
       execute_mr_web_hooks
 
       true