dillon1000/react

[Flight] Treat empty message as a close signal (#33756)

We typically treat an empty message as closing the debug channel stream
but for the Noop renderer we don't use an intermediate stream but just
pass the message through.


https://github.com/facebook/react/blob/bbc13fa17be8eebef3e6ee47f48c76c0c44e2f36/packages/react-server-dom-webpack/src/client/ReactFlightDOMClientBrowser.js#L59-L60

For that simple case we should just treat it as a close without an
intermediate stream.