rmore refinement to mmif describe cmd

[keighrim]

see #326 for discussion.

[codecov]

Codecov Report

❌ Patch coverage is 44.00000% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.81%. Comparing base (d9c898c) to head (7a804f5).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
mmif/utils/workflow_helper.py	42.85%	28 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #342      +/-   ##
===========================================
- Coverage    86.37%   85.81%   -0.57%     
===========================================
  Files           15       15              
  Lines         1886     1903      +17     
===========================================
+ Hits          1629     1633       +4     
- Misses         257      270      +13     

Flag	Coverage Δ
unittests	85.81% <44.00%> (-0.57%)	⬇️

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