Fix bug #2498696: animating corpses which were killed by chaos spawn causing an

assertion. (Maybe CrawlStoreValue should do a cast when possible instead of asserting in a situation like this?)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8420 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 11, 2009
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