message: fixed empty error on recording cancellation
diff: @@ -248,11 +248,11 @@ class UiState {
  }
  @action.bound async startRecording(isInvalid) {
  - try {
  let startingUrl = this.baseUrl;
  if (!startingUrl) {
  startingUrl = await ModalState.selectBaseUrl(isInvalid);
  }
  + try {
  await this.recorder.attach(startingUrl);
  this._setRecordingState(true);
  await this.emitRecordingState();
  