FIX: read file with missing metadata

[kmuehlbauer]

• Closes issue with Nexrad file #292
• Tests added
• Changes are documented in history.md

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.43%. Comparing base (c843798) to head (7acb6e6).

Files with missing lines	Patch %	Lines
xradar/io/backends/nexrad_level2.py	73.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
- Coverage   93.50%   93.43%   -0.07%     
==========================================
  Files          27       27              
  Lines        5555     5564       +9     
==========================================
+ Hits         5194     5199       +5     
- Misses        361      365       +4     

Flag	Coverage Δ
notebooktests	0.00% <0.00%> (ø)
unittests	93.43% <73.33%> (-0.07%)	⬇️

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[kmuehlbauer]

@aladinor Would you mind having a look here? If these changes help resolve #292, I'll add tests an finish up the PR.

[aladinor]

@kmuehlbauer, your PR looks fine. The file I shared in #292 is corrupted. I think you can merge it

[kmuehlbauer]

Thanks @aladinor! I'll finish this the next days.