Debugging Errors - Highlight Within Visual Script

I think it would be nice to highlight an area of visual script where I have made an error (e.g. I was previously setting an asset on an object, and this asset has since been deleted - like in the case applying an asset image to an object, but then I removed the asset from the my project). At the moment, sometimes it can be difficult to know if there is an error in the project - especially in the case where you have a lot of subgraphs. I think it would be nice to be able to automatically scan the visual script and highlight nodes where no target has been specified or where there is an error.