[whatwg/streams] Fix attempting to get the chunk size after strategy is cleared (PR #1333)

Although a better fix might be to delay size calculation until we've verified that we're not in the erroring or errored states, that has observable differences for certain bad-strategy cases already in the WPT suite, and multiple implementations seem to have converged on this particular fix already.

Closes #1331.

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<a href="https://whatpr.org/streams/1333.html" title="Last updated on Nov 26, 2024, 6:57 AM UTC (bd98d4d)">Preview</a> | <a href="https://whatpr.org/streams/1333/8ebee1f...bd98d4d.html" title="Last updated on Nov 26, 2024, 6:57 AM UTC (bd98d4d)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1333

-- Commit Summary --

  * Fix attempting to get the chunk size after strategy is cleared

-- File Changes --

    M index.bs (4)
    M reference-implementation/lib/abstract-ops/writable-streams.js (5)

-- Patch Links --

https://github.com/whatwg/streams/pull/1333.patch
https://github.com/whatwg/streams/pull/1333.diff

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