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

---

pygit2: 1.15.0

[qaqland]

after checking upstream, i think error is the expect behavior.

sorry for this issue