tractor/nooz/264.bugfix.rst

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.