message: telemetry: don't query params without autopilot
  This avoids a bunch of warnings that appear when the telemetry plugin is
  used with a MAVLink component other than the autopilot.
diff: @@ -136,6 +136,7 @@ void TelemetryImpl::enable()
  // FIXME: The calibration check should eventually be better than this.
  // For now, we just do the same as QGC does.
  + if (_parent->has_autopilot()) {
  _parent->get_param_int_async(
  std::string("CAL_GYRO0_ID"),
  std::bind(
  @@ -180,9 +181,13 @@ void TelemetryImpl::enable()
  _parent->get_param_int_async(
  std::string("SYS_HITL"),
  std::bind(
  - &TelemetryImpl::receive_param_hitl, this, std::placeholders::_1, std::placeholders::_2),
  + &TelemetryImpl::receive_param_hitl,
  + this,
  + std::placeholders::_1,
  + std::placeholders::_2),
  this);
  }
  +}
  void TelemetryImpl::disable() {}
  