Fixed logic and commented a temporarily broken BIDS (lacking README) dataset

[TheChymera]

Error fixed upstream but it was the specification schema rather than the example data which was broken, so we won't have access to it until the new release; removing test dataset from whitelist until then.

[codecov]

Codecov Report

Base: 88.14% // Head: 88.27% // Increases project coverage by +0.13% 🎉

Coverage data is based on head (01640ef) compared to base (48a222f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1148      +/-   ##
==========================================
+ Coverage   88.14%   88.27%   +0.13%     
==========================================
  Files          73       73              
  Lines        8727     8800      +73     
==========================================
+ Hits         7692     7768      +76     
+ Misses       1035     1032       -3     

Flag	Coverage Δ
unittests	88.27% <100.00%> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dandi/tests/fixtures.py	98.19% <ø> (ø)
dandi/tests/test_validate.py	100.00% <100.00%> (ø)
dandi/validate.py	97.72% <0.00%> (-2.28%)	⬇️
dandi/tests/test_files.py	100.00% <0.00%> (ø)
dandi/cli/tests/test_digest.py	100.00% <0.00%> (ø)
dandi/download.py	88.04% <0.00%> (+0.04%)	⬆️
dandi/utils.py	82.31% <0.00%> (+0.10%)	⬆️
dandi/support/threaded_walk.py	93.10% <0.00%> (+0.24%)	⬆️
dandi/files/zarr.py	88.03% <0.00%> (+1.17%)	⬆️
dandi/files/_private.py	98.03% <0.00%> (+2.20%)	⬆️

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[yarikoptic]

Thanks!