Error for topping exports in projects with invalid layers

[davreu]

In our QGIS project (3.28.7) we have an invalid layer (a WMS layer without any source information).
Exporting toppings (v7.6.1) produces a python error. After deleting aforementioned layer, the topping export works fine.

It would be nice if ModelBaker produced a pop-up to warn that there's an invalid layer in the project instead of producing a python error, which is hard to decipher.

[signedav]

Thanks. Yes. Or ignore would be better than a python error as well.