dgn.set_random_mon_list() shouldn't complain about it being used outside of

portal vaults if the map is being loaded/validated.

dgn.set_random_mon_list() turns "nothing" into "program bug", which is the correct behaviour if you sometimes want the Shadow Creatures spell to fail.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7846 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 16, 2008
34O32STE6HBHCGJASFVZ77CZ7ZH4WPWH53U7YBHJ3DHJZEZKOUOQC
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