Guard against referncing repeat_again_rec.keys[0] if the queue is empty.

Reset previous command state if a repeated command is interrupt by a key press.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7607 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on November 25, 2008
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