PG: null in containedAll

[dplewis]

Prevent type error when null is in array for containedAll

Closes: #4019

[codecov]

Codecov Report

Merging #4026 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4026      +/-   ##
==========================================
- Coverage   90.73%   90.71%   -0.03%     
==========================================
  Files         116      116              
  Lines        7890     7891       +1     
==========================================
- Hits         7159     7158       -1     
- Misses        731      733       +2

Impacted Files	Coverage Δ
...dapters/Storage/Postgres/PostgresStorageAdapter.js	96.5% <100%> (+0.12%)	⬆️
...rc/Adapters/Storage/Mongo/MongoSchemaCollection.js	96% <0%> (-2.67%)	⬇️
src/RestWrite.js	93.29% <0%> (-0.2%)	⬇️

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