[whatwg/url] Fix validation error when a URL has credentials but no host (PR #793)

Since this branch requires that `atSignSeen` is true, we must have already emitted an `invalid-credentials` validation error and this emission must be a duplicate.

What this check is actually doing is confirming that the host is not empty before it begins parsing it, so `host-missing` is a more appropriate error to emit.

- [ ] At least two implementers are interested (and none opposed):
   * …
   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
   * Deno: …
   * Node.js: …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/793

-- Commit Summary --

  * Fix validation error when a URL has credentials but no host

-- File Changes --

    M url.bs (2)

-- Patch Links --

https://github.com/whatwg/url/pull/793.patch
https://github.com/whatwg/url/pull/793.diff

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