Added a precautionary check for an empty delay queue (really shouldn't be

possible) during run.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1535 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on June 4, 2007
JA4M6R2EAGW5DZOXJTRCN65Q2TVQ667OPMDYYCVVQU45WSFAYFKAC
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