[whatwg/fetch] Handle null and failure for Access-Control-Expose-Headers (#434)

Fixes #433.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/434

-- Commit Summary --

  * Handle null and failure for Access-Control-Expose-Headers

-- File Changes --

    M fetch.bs (7)

-- Patch Links --

https://github.com/whatwg/fetch/pull/434.patch
https://github.com/whatwg/fetch/pull/434.diff

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