Fixed segfault when using &Z (bobbens).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2334 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on October 5, 2007
V5N2KDMZB26TLLIRDLICRM3CNOMHKYHAIZ5HCGDOWF57GDAY7JCAC
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