fix: bug when multiple domains are used in a router

[jsw800]

Contributor checklist

• [X] Bug fixes include regression tests
• [X] Features include unit/acceptance tests

I noticed this bug in the new router when I added a second domain to my router. It was pretty easy to track down the source of the issue so I figured I'd just submit a PR.

Basically the issue arises because :error is truthy, so if this inner Enum.find_value returns error on the first iteration (i.e. when checking for a match in the first domain), then the whole loop will return :error, even though there are more domains to check. In this scenario the intended behavior should be to return nil.

[zachdaniel]

🚀 Thank you for your contribution! 🚀

[zachdaniel]

Released in v1.0.0-rc.6