Fix: bug in nwbToTable (Issue #597 )

[ehennestad]

Fix #597

Motivation

fix bug

How to test the behavior?

See issue

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.59%. Comparing base (c51099f) to head (79e76a1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #598      +/-   ##
==========================================
- Coverage   90.60%   90.59%   -0.01%     
==========================================
  Files         106      106              
  Lines        4671     4670       -1     
==========================================
- Hits         4232     4231       -1     
  Misses        439      439              

Flag	Coverage Δ
	90.59% <100.00%> (?)

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[bendichter]

Can you please add a test that fails before and passes now?