fix(Android): Fix null error writing on disconnected socket

Author: Rapsssito

android/src/main/java/com/asterinet/react/tcpsocket/TcpSocketClient.java

@@ -103,6 +103,10 @@ public void write(final int msgId, final byte[] data) {
         writeExecutor.execute(new Runnable() {
             @Override
             public void run() {
+                if (socket == null) {
+                    receiverListener.onError(getId(), new IOException("Attempted to write to closed socket"));
+                    return;
+                }
                 try {
                     socket.getOutputStream().write(data);
                     receiverListener.onWritten(getId(), msgId, null);