BlobReference __getattr__ can only throw AttributeError (#26654)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26654
As per python contract, __getattr__ can only throw AttributeError. Throwing something else breaks hasattr() and causes upstream issues.
Similar bug was in pytorch earlier.
Test Plan: builds
Differential Revision: D17529471
fbshipit-source-id: bb6ac6c9e3be8b80fa2967e6a2e293afd1594cf9
