message: add nullptr check to GetLeftRightLaneCorridor
diff: @@ -14,6 +14,11 @@ namespace map {
  std::pair<LaneCorridorPtr, LaneCorridorPtr>
  RoadCorridor::GetLeftRightLaneCorridor(const Point2d& pt) const {
  LaneCorridorPtr current_lane_corr = GetCurrentLaneCorridor(pt);
  + if(!current_lane_corr) {
  + return std::make_pair(
  + LaneCorridorPtr(nullptr),
  + LaneCorridorPtr(nullptr));
  + }
  LanePtr current_lane = current_lane_corr->GetCurrentLane(pt);
  std::shared_ptr<Lane> left_lane, right_lane;
  if (current_lane) {
  