Set Semantics: Notes Gives Error

[enuddleyarbl]

I've noticed this before, but since it happens all the time, I figured I'd better report it. In an EPUB3, if I go to Tools > Set Semantics > Notes and point it at a file, it errors out with:

calibre, version 6.10.0
ERROR: Unhandled exception: <b>KeyError</b>:'notes'

calibre 6.10  embedded-python: True
Windows-10-10.0.19045-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19045')
Python 3.10.1
Windows: ('10', '10.0.19045', 'SP0', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeACSM (0, 0, 16) && DeDRM (10, 0, 3) && Diaps Editing Toolbag (0, 4, 0) && EpubCheck (0, 2, 4) && EpubSplit (3, 5, 0) && Goodreads (1, 7, 1) && KindleUnpack - The Plugin (0, 83, 1) && Kobo Utilities (2, 16, 6) && KoboTouchExtended (3, 6, 3) && Modify ePub (1, 8, 1) && Quality Check (1, 13, 3) && ScrambleEbook (0, 6, 0)
Traceback (most recent call last):
  File "calibre\gui2\tweak_book\boss.py", line 1056, in set_semantics
  File "calibre\gui2\tweak_book\widgets.py", line 989, in apply_changes
KeyError: 'notes'

I haven't run into any problems with any of the other Semantic classes in that tool.

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OS: Microsoft Windows 10 Professional (x64) Build 19045.2364

[kovidgoyal]

https://github.com/kovidgoyal/calibr...e7351bd0ffc496

[enuddleyarbl]

Thanks, Kovid.