On superuser.com, I saw a link to the tag <a href="https://superuser.com/questions/tagged/cybersex">cybersex</a> in the <a href="https://superuser.com/tags">tags</a> listing page (leading to the page title "Hottest 'cybersex' Questions). No questions are associated - presumably because it had been added through a spam question that was subsequently deleted. I would expect that in such a case (all questions associated with a specific tag have been deleted) that the tag itself would be deleted as well. Right?