In _raise_corpse(), if animating a corpse fails because there's nowhere

to place the resulting zombie, return false and don't destroy the corpse. This should fix [1988590].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5691 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 9, 2008
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