BF: do not crash if cannot determine version in standalone execution (only)

[yarikoptic]

TODO: verify that test failed before & fix the test so then it would pass here.. most likely needs a new python -m venv temppath and run with temppath/bin/python -- should not crash and should complain with the warning like we do.

[mergify]

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Codecov Report

❌ Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.85%. Comparing base (f38dcf5) to head (c03d569).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/con_duct/__main__.py	44.44%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #316      +/-   ##
==========================================
- Coverage   91.32%   90.85%   -0.48%     
==========================================
  Files           7        7              
  Lines         945      951       +6     
  Branches      125      126       +1     
==========================================
+ Hits          863      864       +1     
- Misses         59       64       +5     
  Partials       23       23              

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