unstructured

aa7b7c87 - fix: model_name being None raises attribution error (#1822)

fix: model_name being None raises attribution error (#1822) This PR resolves #1754 - function wrapper tries to use `cast` to convert kwargs into `str` but when a value is `None` `cast(str, None)` still returns `None` - fix replaces the conversion to simply using `str()` function call