make select not fail on sidecar without HED key pair

[bendhouseart]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.00%. Comparing base (e89717b) to head (2918f09).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #346   +/-   ##
=======================================
  Coverage   87.00%   87.00%           
=======================================
  Files          51       51           
  Lines        3887     3887           
  Branches      624      624           
=======================================
  Hits         3382     3382           
  Misses        495      495           
  Partials       10       10           

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[bendhouseart]

Produces HED error on https://github.com/bids-standard/bids-examples/tree/bep023 on petprep/ folder, haven't tested on other included derivative.