Don't try to mark broken MR as mergable
In case merge request is broken, we shouldn't check if the sha is mergable, as it will be null, and there's no point, as we know that it's not mergable.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
In case merge request is broken, we shouldn't check if the sha is mergable, as it will be null, and there's no point, as we know that it's not mergable.