fix: where-filter null handling improved

[mastodon0]

The where-filter didn't handle nulls/undefineds properly. The comparison of NullDrop and null would fail and the list would be empty.

[coveralls]

Pull Request Test Coverage Report for Build 1744870016

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 1735181086:	0.0%
Covered Lines:	2031
Relevant Lines:	2031

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💛 - Coveralls

[github-actions[bot]]

:tada: This PR is included in version 9.34.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: