Reporting an already deleted spammer results in a 500 error
I experienced the following situation today:
I saw a bunch of spammers and went to the user profiles to report them.
In the short time i needed to type in the report message @marin already found and deleted the accounts.
This resulted in a 500 error when I tried to submit the abuse report.
This situation is unlikely to happen often, but we should handle it gracefully nontheless.