Fix crash in the shadow crypt

git-svn-id: http://svn.net-core.org/repos/t-engine4@2526 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/ai/target.lua

@@ -27,7 +27,7 @@ newAI("target_simple", function(self)
 	-- Get list of actors ordered by distance
 	local arr = self.fov.actors_dist
 	local act
-	local sqsense = math.max(self.lite, self.infravision or 0, self.heightened_senses or 0)
+	local sqsense = math.max(self.lite or 0, self.infravision or 0, self.heightened_senses or 0)
 	sqsense = sqsense * sqsense
 	for i = 1, #arr do
 		act = self.fov.actors_dist[i]
@@ -36,7 +36,7 @@ newAI("target_simple", function(self)
 		if act and self:reactionToward(act) < 0 and not act.dead and
 			(
 				-- If it has lite we can always see it
-				(act.lite > 0)
+				((act.lite or 0) > 0)
 				or
 				-- Otherwise check if we can see it with our "senses"
 				(self:canSee(act) and self.fov.actors[act].sqdist <= sqsense)