Fix test stream and remove warnings

LidarPlugin/IO/Lidar/Common/vtkLidarPacketInterpreter.cxx

@@ -76,6 +76,15 @@ bool vtkLidarPacketInterpreter::SplitFrame(bool force)
   return true;
 }
 
+vtkSmartPointer<vtkPolyData> vtkLidarPacketInterpreter::GetLastFrameAvailable()
+{
+  if(this->Frames.size() != 0)
+  {
+    return this->Frames.back();
+  }
+  return nullptr;
+}
+
 //-----------------------------------------------------------------------------
 void vtkLidarPacketInterpreter::SetLaserSelection(int index, int value)
 {