Workaround for users with an empty fullname

[mr-c]

May fix part of #1770

• add test with mock to confirm this behavior

[mr-c]

@sdruskat can you give me the output of python3 -c "import getpass; print(getpass.getuser()); import os; import pwd; print(pwd.getpwuid(os.getuid())[4])" on your WSL2 system? I'll use that to improve the test

[sdruskat]

python3 -c "import getpass; print(getpass.getuser()); import os; import pwd; print(pwd.getpwuid(os.getuid())[4])"

stephan
,,,

[codecov]

Codecov Report

Merging #1771 (7775a7d) into main (60f0dac) will decrease coverage by 0.00%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main    #1771      +/-   ##
==========================================
- Coverage   82.47%   82.47%   -0.01%     
==========================================
  Files          47       47              
  Lines        8195     8198       +3     
  Branches     2235     2236       +1     
==========================================
+ Hits         6759     6761       +2     
- Misses        941      942       +1     
  Partials      495      495              

Impacted Files	Coverage Δ
cwltool/provenance.py	80.76% <33.33%> (-0.31%)	⬇️
cwltool/singularity.py	65.80% <0.00%> (+0.43%)	⬆️

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