ensure version_detail is not None

[andre-merzky]

This fixes radical-cybertools/radical.pilot/issues/3228.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 62.17%. Comparing base (37ddd89) to head (aa826a1).
Report is 2 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/radical/utils/get_version.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #418      +/-   ##
==========================================
- Coverage   62.18%   62.17%   -0.01%     
==========================================
  Files          62       62              
  Lines        6899     6901       +2     
==========================================
+ Hits         4290     4291       +1     
- Misses       2609     2610       +1     

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[mtitov]

LGTM!