[whatwg/streams] Don't error an errored WritableStream on messageerror (#1069)

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1069


-- Commit Summary --

  * Don't error an errored WritableStream on messageerror

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/1069.patch

https://github.com/whatwg/streams/pull/1069.diff


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