Server crashes when an invalid Websocket frame is sent.

[zotoli]

Discovered this while trying to close the socket. If the status code sent is invalid the server crashes. Node.js version is 15.7.0.

This closed issue: websockets/ws#1777 suggests there needs to be a listener for the 'error' event:

wss.on('connection', function connection(ws) {
  ws.on('error', console.error);

  ws.on('message', function incoming(message) {
    console.log('received: %s', message);
  });

  ws.send('something');
});

Error message:

node:events:356
      throw er; // Unhandled 'error' event
      ^

RangeError: Invalid WebSocket frame: invalid status code 9
    at Receiver.controlMessage (/home/can/nrg_ws/MR_ws/robofleet/robofleet_server/node_modules/ws/lib/receiver.js:463:18)
    at Receiver.getData (/home/can/nrg_ws/MR_ws/robofleet/robofleet_server/node_modules/ws/lib/receiver.js:349:42)
    at Receiver.startLoop (/home/can/nrg_ws/MR_ws/robofleet/robofleet_server/node_modules/ws/lib/receiver.js:142:22)
    at Receiver._write (/home/can/nrg_ws/MR_ws/robofleet/robofleet_server/node_modules/ws/lib/receiver.js:77:10)
    at writeOrBuffer (node:internal/streams/writable:400:12)
    at _write (node:internal/streams/writable:341:10)
    at Receiver.Writable.write (node:internal/streams/writable:345:10)
    at Socket.socketOnData (/home/can/nrg_ws/MR_ws/robofleet/robofleet_server/node_modules/ws/lib/websocket.js:875:35)
    at Socket.emit (node:events:379:20)
    at addChunk (node:internal/streams/readable:313:12)
Emitted 'error' event on WebSocket instance at:
    at Receiver.receiverOnError (/home/can/nrg_ws/MR_ws/robofleet/robofleet_server/node_modules/ws/lib/websocket.js:780:13)
    at Receiver.emit (node:events:379:20)
    at emitErrorNT (node:internal/streams/destroy:188:8)
    at emitErrorCloseNT (node:internal/streams/destroy:153:3)
    at processTicksAndRejections (node:internal/process/task_queues:81:21) {
  [Symbol(status-code)]: 1002
}
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[zotoli]

Confirmed this change fixes the crash.