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Clearing it is not something you can do, but what you can do is test for whether there's a valid selection before checking what's in it - if there isn't anything valid, go down a different code path that skips that choice, or maybe doesn't create the candidate field for that selector, so the selector gets hidden.
I was wondering - what is this intended to handle that the existing options to turn infusions on and off on the in-play tab doesn't handle? I just looked at my own Kineticist character, and when I click on Cold Blast, at the top of the description text, it says "modified burn cost: 0", and then if I turn on Entangling Infusion, the blast's name changes to Entangling Cold Blast, and the modified burn cost is now 1 (I'm level 6 so I've got infusion specialization 1).
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