fix value check of EFFECT_AVOID_BATTLE_DAMAGE

c==nil means direct attack

c2980764.lua

@@ -32,7 +32,7 @@ function c2980764.initial_effect(c)
 	c:RegisterEffect(e5)
 end
 function c2980764.tglimit(e,c)
-	return c:IsAttribute(ATTRIBUTE_DARK)
+	return c and c:IsAttribute(ATTRIBUTE_DARK)
 end
 function c2980764.sumlimit(e,c)
 	return c:IsAttribute(ATTRIBUTE_DARK)

c72006609.lua

@@ -65,5 +65,5 @@ function c72006609.thop(e,tp,eg,ep,ev,re,r,rp)
 	end
 end
 function c72006609.tglimit(e,c)
-	return not c:GetBattleTarget():GetColumnGroup():IsContains(c)
+	return c and not c:GetBattleTarget():GetColumnGroup():IsContains(c)
 end