If you attempt to delete a question which has answers, you first see:
Clicking "Delete Question" pops up the following error banner:
This is problematic for two reasons. First, the "you can't do this" should appear when you first click "Delete" and not after "Delete-->Delete Question--> jk you can't."
Second, it provides users guidance to flag for a moderator to delete it. However, in many (most?) cases moderators actually do not delete questions in situations like this, even though the guidance explicitly calls it out.
My recommendation is to just remove the second half of this prompt. It would be nice to have better guidance, too, but the easiest solution is to just make the prompt say, "Sorry, this question has answers and cannot be deleted."