tags 673971 + pending thanks postrm checks if the webserver it is trying to remove the config for is used at all. At that time in your test, apache2 has already been removed, otherwise it would have performed the purge correctly.
I don't remember why it performs that check and I have now loosened it. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org