SkeletalCreature: set default appearancegenes to null in constructor
SkeletalCreature: set default appearancegenes to null in constructor

crystalline/openc2e,bdonlan/openc2e,crystalline/openc2e,ccdevnet/openc2e,ccdevnet/openc2e,ccdevnet/openc2e,bdonlan/openc2e,bdonlan/openc2e,crystalline/openc2e,ccdevnet/openc2e,ccdevnet/openc2e,crystalline/openc2e,ccdevnet/openc2e,crystalline/openc2e,bdonlan/openc2e