fix: error is raised when DevTools are closed while sending message

In case you open Chrome DevTools and close them while the iOS runtime still sends messages, an error is raised in CLI:
```
Error: WebSocket is not open: readyState 2 (CLOSING)
```

The problem is that we are using Transform stream between the communication and close event of the socket is not raised until the stream flushes its current state.
Fix it by skipping the write operation in case the socket is not in OPEN state.

Author: rosen-vladimirov

lib/device-sockets/ios/app-debug-socket-proxy-factory.ts

@@ -138,7 +138,12 @@ export class AppDebugSocketProxyFactory extends EventEmitter implements IAppDebu
 			appDebugSocket.pipe(packets);
 
 			packets.on("data", (buffer: Buffer) => {
-				webSocket.send(buffer.toString(encoding));
+				const message = buffer.toString(encoding);
+				if (webSocket.readyState === webSocket.OPEN) {
+					webSocket.send(message);
+				} else {
+					this.$logger.trace(`Received message ${message}, but unable to send it to webSocket as its state is: ${webSocket.readyState}`);
+				}
 			});
 
 			webSocket.on("error", err => {