Fixes raising wrong exceptions, left over from #1090

[thorbjoernl]

Change Summary

Fix exceptions

Related issue number

NA

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 79.25%. Comparing base (cadc4ab) to head (1753611).
Report is 1 commits behind head on main-dev.

Files	Patch %	Lines
pyaerocom/aeroval/coldatatojson_engine.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1133   +/-   ##
=========================================
  Coverage     79.25%   79.25%           
=========================================
  Files           110      110           
  Lines         19103    19103           
=========================================
  Hits          15140    15140           
  Misses         3963     3963           

Flag	Coverage Δ
unittests	79.25% <0.00%> (ø)

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