[whatwg/url] IPv4 parser: handle the empty string (#189)

This is a theoretical issue once #185 lands, but as discussed it seems
good to address this anyway. Fixes #79.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/189

-- Commit Summary --

  * IPv4 parser: handle the empty string

-- File Changes --

    M url.bs (13)

-- Patch Links --

https://github.com/whatwg/url/pull/189.patch
https://github.com/whatwg/url/pull/189.diff

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https://github.com/whatwg/url/pull/189