dreadmaster and disperse magic

[trev]

ran into this problem when a dreadmaster uses disperse magic. The spell disperses Gloom and one of the chants (from escort quest) but not Acidic Skin, though then your character gets a few (free) moves while the ai seems to do nothing. Thereafter you can continue as though nothing has happened!

dumb ai uses T_DISPERSE_MAGIC
[LOG] Dreadmaster casts Disperse Magic.
USING table: 087961F8 Disperse Magic
[Equilibrium] Use chance: 91.259926265249 :: 2.5
stack traceback:
/engine/interface/GameTargeting.lua:217: in function 'getTarget'
/engine/interface/ActorTalents.lua:170: in function 'useTalentMessage'
/mod/class/Actor.lua in function 'preUseTalent'
/engine/interface/ActorTalents.lua:133: in function 'useTalent'
/mod/class/Actor.lua in function 'forceUseTalent'
/data/talents/spells/meta.lua:65: in function 'action'
/engine/interface/ActorTalents.lua:117: in function </engine/interface/ActorTalents.lua:111>
Lua Error: /engine/interface/ActorTalents.lua:127: /engine/interface/GameTargeting.lua:217: attempt to index local 'typ' (a nil value)
At [C]:-1
At [C]:-1 error
At /engine/interface/ActorTalents.lua:127 useTalent
At /engine/ai//talented.lua:50 runAI
At /engine/ai//talented.lua:59 doAI
At /mod/class/NPC.lua:43 act
At /engine/GameEnergyBased.lua:73 tick
At /engine/GameTurnBased.lua:44 tick
At /mod/class/Game.lua:460

[darkgod]

fixed