[whatwg/fetch] Check if fetch record's "fetch" instance needs to be nullable (Issue #1403)

See https://github.com/whatwg/fetch/pull/1329/files#r737329884
The wording in fetch makes it seem that there could be cases where a fetch record can have a null reference to its corresponding fetch algorithm (or controller). Maybe it's not the case and it can be a strong reference.

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