NormalMap gets overriden on import

[freeminders123]

If an FBX file only has diffuse and normal map defined, the switch-case in SCNMaterial + TextureInfo:makePropertyContents(textureInfo:) overrides the normal.contents with nil.

Could you add:

if (textureInfo.getMaterialPropertyContents() == nil) {
return
}
before the switch textureInfo.textureType
?
This should work, tested it with the current Version