[whatwg/fetch] Request.destination and the empty string (#765)

The spec [says](https://fetch.spec.whatwg.org/#concept-request-destination) that the default value of `destination` is the empty string, but never defines explicitly what should happen if it is in fact the empty string. The closest I can find is the exemplar table that comes a couple of paragraphs later, and it does not clearly explain what the meaning of `""` is for `destination`.

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