fix: make "clinvar-genes import" more robust (#247)

[holtgrewe]

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (bf74e69) 71.07% compared to head (f31b6ea) 71.03%.
Report is 1 commits behind head on main.

❗ Current head f31b6ea differs from pull request most recent head 5f526f2. Consider uploading reports for the commit 5f526f2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #258      +/-   ##
==========================================
- Coverage   71.07%   71.03%   -0.04%     
==========================================
  Files          61       61              
  Lines        5738     5742       +4     
==========================================
+ Hits         4078     4079       +1     
- Misses       1660     1663       +3     

Files	Coverage Δ
src/clinvar_genes/cli/import.rs	92.00% <92.85%> (-1.16%)	⬇️

... and 1 file with indirect coverage changes

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