FIX Return null error solved for DBQueryBuilder::shouldBuildTraceComment

[Ofthemasses]

Description

Solves scenario where DBQueryBuilder::shouldBuildTraceComment returns null, causing a TypeError

Manual testing steps

Issues

• TypeError when running SaphireTest::logInWithPermission #11240 (Partial Solution)

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[Ofthemasses]

Would you like a test written alongside my changes?

[GuySartorelli]

No test needed.
It's weird that this caused a problem given there is a default value set for that config - this code must have been triggered before the config manifest was booted, I guess? Is that even possible?
Anyway, doesn't harm anything so it's probably fine. Just a weird thing to have to do - we won't be adding this for all config everywhere so it's weird to need it here.