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tractor/nooz/264.bugfix.rst

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Fix ``Portal.run_in_actor()`` returns ``None`` result.
``None`` was being used as the cached result flag and obviously breaks
on a ``None`` returned from the remote target task. This would cause an
infinite hang if user code ever called ``Portal.result()`` *before* the
nursery exit. The simple fix is to use the *return message* as the
initial "no-result-received-yet" flag value and, once received, the
return value is read from the message to avoid the cache logic error.