[whatwg/url] Ambiguity with the 1st clause of the "no scheme state" in basic parser. (Issue #867)

dannyniu created an issue (whatwg/url#867)

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

The clause says: 

> If base is null, or base has an [opaque path](https://url.spec.whatwg.org/#url-opaque-path) and [c](https://url.spec.whatwg.org/#c) is not U+0023 (#), [missing-scheme-non-relative-URL](https://url.spec.whatwg.org/#missing-scheme-non-relative-url) [validation error](https://url.spec.whatwg.org/#validation-error), return failure.

There's an ambiguity as to whether the condition is interpreted as:

- `base === null || (path_is_opaque(base) && c != "#")` or
- `(base === null || path_is_opaque(base)) && c != "#"`

Since these 2 conditions have different outcome on some input, it is necessary this be clarified.

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