Check if RenderingAsset is available or get the path

[mikkelnymand4EMUM]

Hello 

I'm trying to get the image property of a MaterialAsset - See image below. 

I've tried several things but what I think got me the closest was the GetRenderingAsset() method of the AppearanceAssetElement class. 

However, I can't seem to get the filepath, or get to test if the image set is actual valid. 

Materials that doesn't have a valid path for the image impacts the performance of the material library alot, so I'm aiming towards creating a command the can clear all of them. 

Any idea how to target the property in the API?