Fix Nonetype has no attribute SetVisibility in _coreg.py [reopen of #13209]

[psyxw]

What does this implement/fix?

For some CTF data, when passing inst='/path/to/fif' to mne.gui.coregistration(inst=inst), it will prompt "Nonetype has no attribute SetVisibility". This is because actors list contain None. A solution is to judge if actor in actors is None. (or using try-except).

I met this problem in mne-1.9.0 Windows 11 Python 3.12.10. I'm willing to provide related fif info file to reproduce the problem :)

[larsoner]

Can you share a data file that shows the problem? I tried:

coreg = mne.gui.coregistration(inst=mne.datasets.testing.data_path() / "CTF" / "somMDYO-18av.ds")

and the GUI came up okay on main.

[psyxw]

Here is an info file. The info file is derived from OMEGA Dataset (CTF format). I read the data with mne.io.read_raw.ctf(), extract info and save. When passing this file to inst in mne.gui.coregistration(), an error Nonetype has no attribute SetVisibility prompts.

[larsoner]

Hmmm I cannot reproduce the issue on main with:

>>> mne.gui.coregistration(inst="meg-01-info.fif", subject="fsaverage", subjects_dir=mne.datasets.sample.data_path() / "subjects")

Screencast.From.2025-04-18.09-37-37.mp4

Is it possible this has already been fixed on main? Did you try main or just the release version v1.9?

[psyxw]

Sound interesting... I clone MNE-python in the main branch to my local disk, replace current version in python and run mne.gui.coregistration, the same error occurs.
If I print the actors, it is something like this:
[Actor (0x665d3520)...] [Actor (0x665d3520)...] [Actor (0x665d3520)...] [Actor (0x665d3520)...] ... [None]
The actors return a list, where the last elements is [None]
Here is a video. Thanks ;)

20250422_144652.mp4

[larsoner]

Okay, not sure why it happens for you and not for me but safe enough to add the change, merged main into the branch to hopefully get CIs green and I'll mark for merge-when-green, thanks in advance @psyxw !

[welcome]

🎉 Congrats on merging your first pull request! 🥳 Looking forward to seeing more from you in the future! 💪