fix traj error exception

libs/reader/pcd_reader.cpp

@@ -52,6 +52,7 @@ bool PcdReader::getNextFrame(PointCloud*& frame) {
   PointCloudI tempFrame;
   double time;
   while (!suceess) {
+    if (pcdIndex_ >= pcdPathVec_.size()) return false;
     string pcdPath = pcdPathVec_.at(pcdIndex_);
     pcdIndex_++;
     pcl::io::loadPCDFile(pcdPath, tempFrame);