[pt2][inductor] guard for __package__ is None (#106056)
Summary:
Guard against errors when __package__ is NoneType
Created from CodeHub with https://fburl.com/edit-in-codehub
Test Plan:
sandcastle + CI
Sandcastle run
Differential Revision: D47803386
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106056
Approved by: https://github.com/jansel
