Make table_to_string() more robust, so it won't raise an error if it encounters

anything weird.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8844 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 28, 2009
PK2ANIIHJ4EUTG3ZWM3MK32YLGXLOETZ47L7KNC7YYJ7O7GAFLBAC
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