Legacy validator permitting (i)EEG files without sidecars

[arnodelorme]

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For iEEG and EEG, the JSON file is not required (we tried using the latest validator). However, they seem to be required for motion capture. CC @dungscout96

Is that by design?

[effigies]

EEG has REQUIRED metadata, as does iEEG. So the absence of JSON sidecar files should be an error.

[dungscout96]

We tried removing _eeg.json and _ieeg.json from test datasets and the current validator (v.1.14.5) didn't complain about it.

[effigies]

Do you have an example dataset for reproducing?