FIX: add missing finally

[kmuehlbauer]

No description provided.

[codecov]

Codecov Report

Merging #581 (ddd92d5) into main (1271cd6) will decrease coverage by 0.92%.
The diff coverage is 74.28%.

@@            Coverage Diff             @@
##             main     #581      +/-   ##
==========================================
- Coverage   88.56%   87.63%   -0.93%     
==========================================
  Files          38       38              
  Lines        9957     9962       +5     
==========================================
- Hits         8818     8730      -88     
- Misses       1139     1232      +93     

Flag	Coverage Δ
notebooktests	0.00% <0.00%> (ø)
unittests	87.63% <74.28%> (-0.93%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
wradlib/clutter.py	93.15% <0.00%> (ø)
wradlib/io/dem.py	12.64% <0.00%> (-75.31%)	⬇️
wradlib/io/xarray.py	86.51% <87.50%> (+0.01%)	⬆️
wradlib/atten.py	82.87% <100.00%> (ø)
wradlib/io/backends.py	91.76% <100.00%> (ø)
wradlib/io/xarray_depr.py	88.08% <100.00%> (ø)
wradlib/ipol.py	90.32% <100.00%> (-0.19%)	⬇️
wradlib/util.py	92.59% <100.00%> (ø)
wradlib/verify.py	100.00% <100.00%> (ø)
wradlib/vis.py	92.68% <100.00%> (-1.96%)	⬇️
... and 4 more

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