[MRG] fix loading without age information / single-column .tsv

doc/authors.rst

@@ -30,3 +30,4 @@
 .. _Clemens Brunner: https://github.com/cbrnr
 .. _Kambiz Tavabi: https://github.com/ktavabi
 .. _Franziska von Albedyll: https://www.researchgate.net/profile/Franziska-Von-Albedyll
+.. _Simon Kern: https://github.com/skjerns

doc/whats_new.rst

@@ -23,7 +23,7 @@ Authors
 ~~~~~~~
 
 People who contributed to this release (in alphabetical order):
-
+* `Simon Kern`_
 * `Adam Li`_
 * `Alex Rockhill`_
 * `Alexandre Gramfort`_
@@ -54,6 +54,8 @@ Bug fixes
 
 - Forcing EDF conversion in :func:`mne_bids.write_raw_bids` properly uses the ``overwrite`` parameter now, by `Adam Li`_ (:gh:`930`)
 
+- Fix loading tsv participant summary information when only subject_id is supplied and all other information (age, gender, handedness) is missing in :func:`mne_bids.make_report` (:gh:`912`)
+
 :doc:`Find out what was new in previous releases <whats_new_previous_releases>`
 
 .. include:: authors.rst

mne_bids/report.py

@@ -229,7 +229,7 @@ def _summarize_participants_tsv(root):
     p_ages = participants_tsv.get('age')
     min_age, max_age = 'n/a', 'n/a'
     mean_age, std_age = 'n/a', 'n/a'
-    n_age_unknown = len(p_ages)
+    n_age_unknown = len(p_ages) if p_ages else len(p_ids)
     if p_ages:
         # only summarize age if they are numerics
         if all([age.isnumeric() for age in p_ages if age != 'n/a']):

mne_bids/tests/test_report.py

@@ -33,6 +33,7 @@
     channel_unit_changed='ignore:The unit for chann*.:RuntimeWarning:mne',
 )
 
+bids_path2 = bids_path.copy()
 
 @pytest.mark.filterwarnings(warning_str['channel_unit_changed'])
 def test_report(tmp_path):
@@ -59,3 +60,36 @@ def test_report(tmp_path):
 analysis (2.0 +/- 0.0 were removed from analysis)."""  # noqa
 
     assert report == expected_report
+
+
+@pytest.mark.filterwarnings(warning_str['channel_unit_changed'])
+def test_report_no_participant_information(tmp_path):
+    """Test report with participants.tsv with participant_id column only."""
+    bids_root = tmp_path
+    raw = mne.io.read_raw_fif(raw_fname, verbose=False)
+    raw.info['line_freq'] = 60
+    bids_path = bids_path2.update(root=bids_root)
+    write_raw_bids(raw, bids_path, overwrite=True, verbose=False)
+
+    # remove all information and check if report still runs
+    (bids_root / 'participants.json').unlink()
+
+    # overwrite participant information to see if report still runs
+    (bids_root / 'participants.tsv').write_text('participant_id\nsub-001')
+
+    report = make_report(bids_root)
+
+    expected_report = \
+    f"""This dataset was created by [Unspecified] and conforms to BIDS version {BIDS_VERSION}.
+This report was generated with MNE-BIDS (https://doi.org/10.21105/joss.01896).
+The dataset consists of 1 participants (sex were all unknown; handedness were
+all unknown; ages all unknown) and 1 recording sessions: 01. Data was recorded
+using a MEG system (Elekta manufacturer) sampled at 300.31 Hz with line noise at
+60.0 Hz. The following software filters were applied during recording:
+SpatialCompensation. There was 1 scan in total. Recording durations ranged from
+20.0 to 20.0 seconds (mean = 20.0, std = 0.0), for a total of 20.0 seconds of
+data recorded over all scans. For each dataset, there were on average 376.0 (std
+= 0.0) recording channels per scan, out of which 374.0 (std = 0.0) were used in
+analysis (2.0 +/- 0.0 were removed from analysis)."""  # noqa
+
+    assert report == expected_report