fix: make applyRule() handly falsy replacements correctly

[fiam]

if dataToReplace is false or 0, it will get ignored otherwise

Fixes #5817

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[Urigo]

thank you @fiam
could you add a test that covers this change?

[fiam]

Hello @Urigo - Thanks for taking a lot my PR. I looked around but I could not find any tests for this component. Should I just add a unit test for Interpolator?

[fiam]

Hello @Urigo - I've added a unit tests in a new file, PTAL