[Loris-dev] BIDS upload in LORIS - Participants file

[Morales Pinzon, Alfredo]

Dear LorisDev team,

I am launching the insertion pipeline in LORIS of a dataset in BIDS format. I am getting the following error:

===
Loading the BIDS dataset with BIDS layout library...
        => BIDS dataset loaded with BIDS layout

Grepping candidates from the BIDS layout...
Validating the list of participants...
Traceback (most recent call last):
  File "bids_import.py", line 431, in <module>
    main()
  File "bids_import.py", line 75, in main
    read_and_insert_bids(bids_dir, config_file, verbose, createcand, createvisit)
  File "bids_import.py", line 157, in read_and_insert_bids
    bids_reader = BidsReader(bids_dir, verbose)
  File "/data_/ipmsa/loris_data/IPMSA/bin/mri/python/lib/bidsreader.py", line 62, in __init__
    self.participants_info = self.load_candidates_from_bids()
  File "/data_/ipmsa/loris_data/IPMSA/bin/mri/python/lib/bidsreader.py", line 114, in load_candidates_from_bids
    self.candidates_list_validation(participants_info)
  File "/data_/ipmsa/loris_data/IPMSA/bin/mri/python/lib/bidsreader.py", line 142, in candidates_list_validation
    for row in participants_info:
TypeError: 'NoneType' object is not iterable
===

It looks like the file “participants.tsv” is required in LORIS, is this correct? In the BIDS specification this file is not required (https://bids-specification.readthedocs.io/en/stable/03-modality-agnostic-files.html#participants-file) and there is no mention in LORIS documentation (https://github.com/aces/Loris-MRI/blob/main/docs/05-PipelineLaunchOptions.md#52---pipeline-launch-for-bids-datasets).

Thank you in advance for your help.

Best regards,
Alfredo.
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