Fix armour acquirement generating no bardings, whoops!

Also, because mundane items are so terribly rare in acquirement use another check to occasionally produce mundane items filling empty equipment slots: If the rolled item is an ego item and you're already wearing an item in the same slot that has the same ego and better or equal enchantment, try for a mundane item filling an empty slot instead.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10500 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on August 7, 2009
4ZLLCF3RTKOEZ6CRNLREKZXZKQTNGQPOZXLA5KRFKEGYWWU72XRAC
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