message: Fix crash if cameras are not found
diff: @@ -107,8 +107,10 @@ Status SystemImpl::getCameraList(
  Status status = sensorEnumerator->searchSensors();
  if (status == Status::OK) {
  auto camera = buildCamera(std::move(sensorEnumerator));
  + if (camera) {
  cameraList.emplace_back(camera);
  }
  + }
  return Status::OK;
  }
  @@ -130,8 +132,10 @@ SystemImpl::getCameraListAtIp(std::vector<std::shared_ptr<Camera>> &cameraList,
  Status status = sensorEnumerator->searchSensors();
  if (status == Status::OK) {
  auto camera = buildCamera(std::move(sensorEnumerator));
  + if (camera) {
  cameraList.emplace_back(camera);
  }
  + }
  return Status::OK;
  }
  