Kunena/Kunena-2.0 — pull request #1020 by Taracque (2012-08-10 09:14:21+00:00)
Title: Non existent topic autorization

Messages which has no topics can't be deleted, as during the Purge process the topic is authorized first.
This patch alway passes authorization if Topic is not existing (category_id == 0), therefore such messages can be purged.