Aiden Grossman a3de2d1b7b
[Github] Do not fail on unknown branches (#181227)
If someone creates user branches and a PR after we start cloning the
repository, but before we collect PRs, we can end up with branches that
do not exist in the repository. In one case this was causing workflow
failures because we expected this to be an invariant.
2026-02-12 12:52:04 -08:00
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