Draft channel versions break version comparison because of None

[sentry]

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This should be resolved by adding a None check to the comparison logic and including all channel version information instead.

Sentry Issue: STUDIO-J6Z

TypeError: '<=' not supported between instances of 'int' and 'NoneType'
(8 additional frame(s) were not displayed)
...
  File "kolibri_public/views_v1.py", line 174, in get_public_channel_lookup
    channel_list = _serialize_channel_version(channel_list)
  File "kolibri_public/views_v1.py", line 74, in _serialize_channel_version
    "version_notes": _get_version_notes(channel, channel_version),
  File "kolibri_public/views_v1.py", line 36, in _get_version_notes
    data = {
  File "kolibri_public/views_v1.py", line 39, in <dictcomp>
    if int(k) <= channel_version.version

[rtibblesbot]

Plan: Fix TypeError: '<=' not supported between instances of 'int' and 'NoneType' in _get_version_notes when channel_version.version is None by adding a None guard that returns all version notes in that case.

• Add regression test for None channel_version.version
• Fix the None guard in _get_version_notes

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@rtibblesbot's comments are generated by an LLM, and should be evaluated accordingly

How was this generated?

• Implemented code following the pre-approved plan using test-driven development (red-green-refactor)
• Ran the project's full test suite and linter before committing
• For UI changes: captured live screenshots to verify rendering
• For backend changes: verified with example API/CLI output