[whatwg/streams] [[stream]] can not be undefined in "get the next iteration result" (Issue #1246)

Step 2 of https://streams.spec.whatwg.org/#rs-asynciterator-prototype-next should be impossible. The reader is acquired internally, so the stream can only become `undefined` after some kind of error or after finishing the iteration.

https://webidl.spec.whatwg.org/#es-asynchronous-iterator-prototype-object tells us that "[getting the next iteration result](https://webidl.spec.whatwg.org/#dfn-get-the-next-iteration-result)" in Step 8.4 can not be invoked when the iteration is finished (Step 8.2).

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