Fix [1842182]: Casting either "Detect Traps" or "Detect Creatures" now

displays "You detect nothing." if nothing is found, just as casting "Detect Traps" does.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2993 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on December 4, 2007
2UUCC7V3WQ5KBHJS4MTKZ5OIELYJHSTUVRPYGPWIQ5JS6D7YIK4AC
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