pytorch

09eb3e66 - don't check 0 elements for cat symbolic diff (#65751)

don't check 0 elements for cat symbolic diff (#65751) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/65751 Fixes symbolic script grad formula for cat to correctly handle empty tensors Test Plan: Existing tests Reviewed By: eellison Differential Revision: D31208364 fbshipit-source-id: d676d9abcc033b56076fa946f58f3db50034502d