Fix: ARRAY_AGG (and other arrays) may return [null].

[isoos]

Fixes #412.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.47%. Comparing base (527f53c) to head (bf19399).
Report is 9 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #413      +/-   ##
==========================================
+ Coverage   84.41%   84.47%   +0.05%     
==========================================
  Files          31       31              
  Lines        3227     3239      +12     
==========================================
+ Hits         2724     2736      +12     
  Misses        503      503              

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