fix: correctly encode a list<string> type when all items are empty

[westonpace]

We probably need to add "encode an empty array" tests for all encoding types.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.37%. Comparing base (7782eb9) to head (276b650).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2653      +/-   ##
==========================================
+ Coverage   79.33%   79.37%   +0.03%     
==========================================
  Files         222      222              
  Lines       64584    64588       +4     
  Branches    64584    64588       +4     
==========================================
+ Hits        51236    51265      +29     
+ Misses      10360    10348      -12     
+ Partials     2988     2975      -13     

Flag	Coverage Δ
unittests	79.37% <100.00%> (+0.03%)	⬆️

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