- A suggested edit is made to a post (question or answer)
- User X review the suggested edit above.
- In the time user X is reading the suggested edit, the author of the post remove the post
- User X clicks Improve and waits - nothing is loaded and no error message.
At this point, user X is confused. He later found out the post is removed.
I think it is better to shown some kind of message to the user to inform them that the post has been removed.