Fix Scene storage options not being used if no other reader_kwargs are passed

[djhoese]

The tests added in #2335 weren't robust enough. This fixes the issues identified in #2381.

• Closes Remote files reading example does not work. #2381
• Tests added
• Fully documented

CC @simonrp84

[codecov]

Codecov Report

Merging #2382 (1f708fd) into main (e33140c) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #2382      +/-   ##
==========================================
+ Coverage   94.67%   94.69%   +0.01%     
==========================================
  Files         329      329              
  Lines       48691    48693       +2     
==========================================
+ Hits        46097    46108      +11     
+ Misses       2594     2585       -9     

Flag	Coverage Δ
behaviourtests	4.42% <0.00%> (+<0.01%)	⬆️
unittests	95.32% <100.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
satpy/utils.py	24.56% <0.00%> (-0.15%)	⬇️
satpy/tests/test_scene.py	99.50% <100.00%> (ø)
satpy/tests/test_config.py	97.35% <0.00%> (+0.37%)	⬆️
satpy/tests/reader_tests/test_vii_base_nc.py	100.00% <0.00%> (+1.24%)	⬆️
satpy/tests/reader_tests/test_nwcsaf_msg.py	100.00% <0.00%> (+1.80%)	⬆️
satpy/tests/reader_tests/test_vii_l1b_nc.py	100.00% <0.00%> (+2.81%)	⬆️
satpy/tests/reader_tests/test_vii_l2_nc.py	100.00% <0.00%> (+6.06%)	⬆️
satpy/tests/reader_tests/test_vii_wv_nc.py	100.00% <0.00%> (+6.06%)	⬆️

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[coveralls]

Coverage: 95.276% (+0.0002%) from 95.276% when pulling 1f708fd on djhoese:bugfix-storageopts-noreaderkwargs into e33140c on pytroll:main.

[simonrp84]

I just tested this and the fix is successful! Thanks.