`MyVariantDifferManager` object has no attribute `release_note`

[erikyao]

Nov 13 17:01:50 su12 python[3420]: ERROR:asyncio:Exception in callback Cron.set_result(<_GatheringFu...ease_note'")]>)
Nov 13 17:01:50 su12 python[3420]: handle: <Handle Cron.set_result(<_GatheringFu...ease_note'")]>)>
Nov 13 17:01:50 su12 python[3420]: Traceback (most recent call last):
Nov 13 17:01:50 su12 python[3420]:   File "/usr/lib/python3.10/asyncio/events.py", line 80, in _run
Nov 13 17:01:50 su12 python[3420]:     self._context.run(self._callback, *self._args)
Nov 13 17:01:50 su12 python[3420]:   File "/opt/home/myvariant/venv/lib/python3.10/site-packages/aiocron/__init__.py", line 112, in set_result
Nov 13 17:01:50 su12 python[3420]:     raise result
Nov 13 17:01:50 su12 python[3420]:   File "/opt/home/myvariant/venv/src/biothings/biothings/utils/manager.py", line 223, in check_pending
Nov 13 17:01:50 su12 python[3420]:     func(src)
Nov 13 17:01:50 su12 python[3420]:   File "/opt/home/myvariant/myvariant.info/src/bin/hub.py", line 133, in <lambda>
Nov 13 17:01:50 su12 python[3420]:     diff_manager.poll("release_note", lambda doc: diff_manager.release_note(old=None, new=doc["_id"]))
Nov 13 17:01:50 su12 python[3420]: AttributeError: 'MyVariantDifferManager' object has no attribute 'release_note'

Occurs at the end of a diff process.