#234 - cas_to_comparable_text fails with null arrays

[reckart]

• Fixed issue
• Added test case

[codecov]

Codecov Report

Merging #235 (39fe252) into main (5f5bb56) will increase coverage by 0.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
+ Coverage   95.85%   96.14%   +0.29%     
==========================================
  Files           4        4              
  Lines        1400     1402       +2     
==========================================
+ Hits         1342     1348       +6     
+ Misses         58       54       -4     

Impacted Files	Coverage Δ
cassis/util.py	98.03% <100.00%> (+2.67%)	⬆️

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