[whatwg/url] Clarify that a domain is never empty (#492)

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<a href="https://whatpr.org/url/492.html" title="Last updated on May 5, 2020, 9:00 AM UTC (ae5e32b)">Preview</a> | <a href="https://whatpr.org/url/492/909218b...ae5e32b.html" title="Last updated on May 5, 2020, 9:00 AM UTC (ae5e32b)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/492

-- Commit Summary --

  * Clarify that a domain is never empty

-- File Changes --

    M url.bs (9)

-- Patch Links --

https://github.com/whatwg/url/pull/492.patch
https://github.com/whatwg/url/pull/492.diff

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