Fix attrs

[aladinor]

• Closes open_nexradlevel2_datatree not showing attributes in any variable #241
• Changes are documented in history.md

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.49%. Comparing base (dc76619) to head (b6d4309).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #242   +/-   ##
=======================================
  Coverage   93.49%   93.49%           
=======================================
  Files          26       26           
  Lines        5028     5028           
=======================================
  Hits         4701     4701           
  Misses        327      327           

Flag	Coverage Δ
notebooktests	79.01% <ø> (ø)
unittests	93.07% <ø> (ø)

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[kmuehlbauer]

Thanks, @aladinor.