Fixed check for heightmap
Fixed check for heightmap

valepu/isometric,MicroWorldwide/isometric,WahlbergRu/Go-In-Shadow,elsewares/isometric,beakable/isometric,WahlbergRu/Go-In-Shadow,beakable/isometric,MicroWorldwide/isometric,valepu/isometric,sh0ber/isometric,sh0ber/isometric,elsewares/isometric