Fix/xlsx no data types

[MartinKl]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.31%. Comparing base (4851472) to head (49aae7a).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/exporter/xlsx.rs	95.74%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #527      +/-   ##
==========================================
+ Coverage   85.30%   85.31%   +0.01%     
==========================================
  Files          73       73              
  Lines       25910    25931      +21     
  Branches    25910    25931      +21     
==========================================
+ Hits        22103    22124      +21     
  Misses       1416     1416              
  Partials     2391     2391              

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