Addresses #9011 useParams()'s new {} return

[JasonKleban]

Addresses #9011 useParams()'s new {} return.

This might be made more general (covering more than the special case of a falsey routeMatch)

[changeset-bot]

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Latest commit: 9cd80a9

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[remix-cla-bot]

Hi @JasonKleban,

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[JasonKleban]

I'm not trying to get in so deep with that CLA so feel free to steal this simple change if you like it exactly as-is.