fix none type in dvc.<...>

[PythonFZ]

No description provided.

[codecov]

Codecov Report

Merging #533 (34ee8c0) into main (7693daa) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #533      +/-   ##
==========================================
+ Coverage   90.04%   90.12%   +0.08%     
==========================================
  Files          19       19              
  Lines        1215     1215              
  Branches      437      437              
==========================================
+ Hits         1094     1095       +1     
+ Misses        120      119       -1     
  Partials        1        1              

Flag	Coverage Δ
fulltest	88.31% <100.00%> (+0.16%)	⬆️

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Impacted Files	Coverage Δ
zntrack/fields/dvc/__init__.py	84.74% <100.00%> (ø)

... and 1 file with indirect coverage changes

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