Accept "none" as a brand without carping about it to stderr.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2511 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on October 21, 2007
DNDSBJEVLBOUBZY23HUBQX7FVHYYPLOUZK7RRAFRCANLXELO2V6QC
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