Fix assertion when changing a monster's god via the Crusade card.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10327 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on July 19, 2009
GNAGCU2BNJNDMKATYT24MLDZPUUJBCEQAX32UI5EZCEZV37TJ57AC
Change contents