In the case where an API request was trying to close as submitted a review

request that hadn't been published yet, we would crash with an unhandled

exception. The problem here is that we added validation to prevent people from

marking unpublished review requests as submitted, but failed to handle that in

the resource code.
We had similar handling in other resources, so I've just copied the logic over.

Issued a close via the dashboard and didn't see an exception on my devserver.