hear a click" instead of "The trap is out of ammo". Also, fix the miscolouring of the lua eating prompt.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7428 c06c8d41-db1a-0410-9941-cceddc491573
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// Exercise T&D if the trap revealed itself.
if (!you_know && this->is_known())
// Exercise T&D if the trap revealed itself, but not if it ran
// out of ammo.
if (!you_know && this->type != TRAP_UNASSIGNED && this->is_known())