[whatwg/url] Empty or null host when scheme is "file:"? (#258)

In the ["file host state"](https://url.spec.whatwg.org/#file-host-state) there are steps where <var>host</var> is set to the empty string, but in the ["path state"](https://url.spec.whatwg.org/#path-state) at some step <var>host</var> is tested for null (and also set to null).

Because of this difference parser will report [validation error](https://url.spec.whatwg.org/#validation-error) for such valid URL:
`file:///C:/path`
In the ["file host state"](https://url.spec.whatwg.org/#file-host-state) <var>host</var> is set to empty string, but in the ["path state"](https://url.spec.whatwg.org/#path-state): "If url’s host is non-null, validation error."

So I think, <var>host</var> must be set to (and tested for) the same value in both cases; Maybe this value must be null?

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