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Check for missing backend id string (#1512)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/1512

Don't use the backend ID field unless it's present.

Reviewed By: lucylq

Differential Revision: D52451737

fbshipit-source-id: eb2dd7832fe4b71e9459b0603c5959d604dcdca9
D
Dave Bort committed
d3dfd1ba201fef63883ed8acdf57367c45b52d33
Parent: fb2554a
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 1/4/2024, 10:42:23 PM