Fixes AI power supplies runtiming after deletion

code/modules/mob/living/silicon/ai/ai.dm

@@ -242,6 +242,7 @@ var/list/ai_verbs_default = list(
 	powered_ai = ai
 	if(isnull(powered_ai))
 		qdel(src)
+		return
 
 	loc = powered_ai.loc
 	use_power(1) // Just incase we need to wake up the power system.
@@ -251,6 +252,7 @@ var/list/ai_verbs_default = list(
 /obj/machinery/ai_powersupply/process()
 	if(!powered_ai || powered_ai.stat & DEAD)
 		qdel(src)
+		return
 	if(!powered_ai.anchored)
 		loc = powered_ai.loc
 		use_power = 0