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* Fix panic in API pulls when headbranch does not exist (#10676) Backport #10676 * Fix panic in API pulls when headbranch does not exist * refix other reference to plumbing.ErrReferenceNotFound Signed-off-by: Andrew Thornton <art27@cantab.net> * Apply suggestions from code review Co-Authored-By: Lauris BH <lauris@nix.lv>