Accept empty addr in UDP on_receive #341
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As per #304, Linux is not setting
msg_namefor receiving from e.g. UDP socket pair. CPython and asyncio will parse the peer address intoNone. However on macOS,msg_nameis set to aAF_UNIXsockaddrcorrectly, so the peer address is an empty string"". This PR tries to maintain the same behavior as CPython asyncio.