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streams: handle null push for transform in async_iterator

Rodrigo Muino Tomonari requested to merge github/fork/davidmarkclements/async-iterator-fix into master

when the readable side of a transform ends any for await loop on that transform stream should also complete. This fix prevents for await loop on a transform stream from hanging indefinitely.

Essential for #28501 (see https://github.com/nodejs/node/pull/28501#discussion_r299248335)

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

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