Architecture_Engine: Fix null handling

[FraserGreenroyd]

Issues addressed by this PR

Fixes #2462

Test files

Changelog

Additional comments

[FraserGreenroyd]

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[pawelbaran]

I have no objections outside of what I have mentioned in my previous comments in previous PRs of this type.

As mentioned in #2465, I am a bit concerned about the creep that these changes may possibly introduce, but it seems that the only way to check it is to merge and see how many weird behaviours bubble up.

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