Fix bad potions not counting as useless and thus being auto-picked up.

Fix bad message when using 'W' with no armour and crash when attempting to enchant armour with no enchantable armour in inventory. Tweak '{' to only prompt if at least one of autoinscription or clearing an existing inscription apply. (FR 2017541)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6567 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 15, 2008
WFIA2XFIWZF3XVLH52GC57XK7A6ECI3K6P7GRZSHPIUBX66OF3OQC
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