fix: warning on transformItem (#3302)

Author: murilo09

data/libs/functions/position.lua

@@ -302,7 +302,9 @@ function Position:transformItem(itemId, itemTransform, effect)
 	local thing = Tile(self):getItemById(itemId)
 	if thing then
 		thing:transform(itemTransform)
-		Position(self):sendMagicEffect(effect)
+		if effect then
+			Position(self):sendMagicEffect(effect)
+		end
 	end
 end