Fix VIRR reader handling valid_range when it is a numpy array

[joleenf]

The valid_range can be an ndarray when it is read, making the boolean if valid_range: the incorrect choice for the data type. Since valid_range can either be an ndarray or None, convert the ndarray to a list so that later boolean checks don't fail.

[codecov]

Codecov Report

Merging #1744 (32c4e02) into main (b2af59a) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #1744      +/-   ##
==========================================
- Coverage   92.83%   92.83%   -0.01%     
==========================================
  Files         260      260              
  Lines       38556    38558       +2     
==========================================
+ Hits        35793    35794       +1     
- Misses       2763     2764       +1     

Flag	Coverage Δ
behaviourtests	4.81% <0.00%> (-0.01%)	⬇️
unittests	93.37% <50.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
satpy/readers/virr_l1b.py	94.59% <50.00%> (-1.24%)	⬇️

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[coveralls]

Coverage decreased (-0.002%) to 93.319% when pulling 32c4e02 on joleenf:virr_l1b into b2af59a on pytroll:main.