Repository.notes KeyError when empty

[qaqland]

repo = pygit2.Repository("xxx-repo")
try:
    repo.notes()
except KeyError as e:
    print(e)

get:

"reference 'refs/notes/commits' not found"

when refs/notes or other note-name not fount, it means note is empty and should return None

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pygit2: 1.15.0