Dont try attack untargetables

i.e. Summon Enabler Stalker is a NPC that will you find near every entry and teleport point in every ini. This could (an should) be blacklistet.

But i.e. in Icecrown, first room, you will find Deathbound Ward . These will be attackable after activating a trap at the bottom, but wrobot try to attack the NPC before it is activated. For the player the target isn't targetable before.