[ONNX] Enable NoneType inputs to export API (#45792)
Summary:
Enables the use of NoneType arguments to inputs tuple in the export API
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45792
Reviewed By: heitorschueroff
Differential Revision: D24312784
Pulled By: bzinodev
fbshipit-source-id: 1717e856b56062add371af7dc09cdd9c7b5646da
