Fix Evaporate not being an explosion and going through walls

(range was uninitialized.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8065 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on December 31, 2008
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