[whatwg/streams] "If flushPromise was rejected with reason r, the..." (Issue #1262)

https://streams.spec.whatwg.org/commit-snapshots/b45c0c5a6c66c73c1e17254976e8a271aecc5592/#transform-stream-default-sink-close-algorithm

> If flushPromise was rejected with reason r, then:​
> 
> Perform \! TransformStreamError\(stream, r\)\.
> 
> Throw readable\.\[\[storedError\]\]\.

This may throw an undefined value if _readable_ is closed when the microtask runs after _flushPromise_ is rejected. Maybe we should do something like

1. Let _error_ be _readable_.\[\[storedError\]\] if _readable_.\[\[state\]\] is "errored", or _r_ otherwise.
2. Throw _error_.

What do you think?

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