[whatwg/fetch] Location header is the empty string (#669)

I'm trying to figure out what happens when you do a fetch() in follow mode, and get a 302 response with a Location header whose value is the empty string.

Chrome returns a response with type 'basic', status 302, and a Location header with the empty string. (It also crashes in debug mode.)  Firefox returns a network error.

For a similar test where Location is omitted, Chrome returns a response with type 'basic', status 302, and no Location header. Firefox returns the same.

What does the spec say and people think? Here is my proposed WPT test for reference:
https://chromium-review.googlesource.com/c/chromium/src/+/910753

@wanderview 

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