Submitting responses without assignees shouldn't be possible

CORE-615
I've got some bad news for you: if_can_edit_request is a deferred helper, so it doesn't work correctly with if_helpers.

The good news is, __GGRC_ADMIN__ will pass if_can_edit_request, so you can just pull #if_can_edit_request out of #if_helpers and nest one of them inside the other one.