better error message fix (#86422)
Summary:
A user had a problem with fx-scripting and the error message can be improved.
Error was shown as:
RuntimeError: Keys for dictionaries used as an argument cannot contain a Node. Got key: {k}
which is obvious not quite helpful.
Test Plan:
Test in a notebook:
{F778667593}
Reviewed By: xunnanxu, SherlockNoMad
Differential Revision: D40157518
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86422
Approved by: https://github.com/SherlockNoMad
