No "Missing Channel" error when missing a _channels.tsv file.

[markromanmiller]

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The BIDS spec for motion data specifies:

Data from different tracking systems MUST be stored in different *_tracksys-_motion.tsv files, each of which is accompanied by *_tracksys-_motion.json and *_tracksys-_channels.tsv files.

However, in the validator, it is possible to have *_motion.tsv files without a corresponding *_tracksys-_channels.tsv file and not cause an error. Specifically, in the zip file attached, there is /sub-07/ses-stand/motion/sub-07_ses-stand_task-dualWalking_tracksys-PhaseSpace2_motion.tsv but no /sub-07/ses-stand/motion/sub-07_ses-stand_task-dualWalking_tracksys-PhaseSpace2_channels.tsv and there is no error regarding this file.

motion_dualtask_missing_channels.zip

I'd first like to confirm this is an issue, and if so, what's the best way to resolve it. Is it as easy as finding all *_motion.tsv files and seeing if they have corresponding *_channels.tsv files?