[whatwg/url] The opaque host parser allows the empty string, contradicting opaque hosts being "non-empty ASCII string[s]" (Issue #908)

Scripter17 created an issue (whatwg/url#908)

### What is the issue with the URL Standard?

1. The [opaque host](https://url.spec.whatwg.org/#opaque-host) definition says "An opaque host is a **non-empty** [ASCII string](https://infra.spec.whatwg.org/#ascii-string) that can be used for further processing." (emphasis mine).

2. The [opaque host parser](https://url.spec.whatwg.org/#concept-opaque-host-parser) currently does nothing to change or reject the empty string, thus returning the empty opaque host.

I think changing the "non-empty" in the opaque host's definition to "possibly empty" is backwards compatible? Any code using the official parser already can't assume opaque hosts are never empty.

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