Don't print backtrace for interpreter errors (#20925)
Summary:
Eager Python errors don't include a backtrace so script shouldn't either
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20925
Pulled By: driazati
Differential Revision: D15499952
fbshipit-source-id: 1169f13ba5578cd52948725eda73de8229146bb1
