[whatwg/fetch] Make sure that potential destination is not the empty string (#549)

This completes https://github.com/whatwg/fetch/pull/547 and makes sure that the potential destination is not the empty string.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/549

-- Commit Summary --

  * Make sure that potential destination is not the empty string

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/549.patch
https://github.com/whatwg/fetch/pull/549.diff

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