[whatwg/fetch] Only set Access-Control-Request-Headers when its value is non-empty (#460)

This is how it's used to be and what the Fetch Standard says now is causing subtle issues on servers.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/460

-- Commit Summary --

  * Only set Access-Control-Request-Headers when its value is non-empty

-- File Changes --

    M fetch.bs (21)

-- Patch Links --

https://github.com/whatwg/fetch/pull/460.patch
https://github.com/whatwg/fetch/pull/460.diff

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