message: wrap num motion primitives
diff: @@ -117,7 +117,8 @@ void python_behavior(py::module m) {
  BehaviorModel,
  shared_ptr<BehaviorMotionPrimitives>>(m,
  "BehaviorMotionPrimitives")
  - .def("ActionToBehavior", &BehaviorMotionPrimitives::ActionToBehavior);
  + .def("ActionToBehavior", &BehaviorMotionPrimitives::ActionToBehavior)
  + .def_property_readonly("num_motion_primitives", &BehaviorMotionPrimitives::GetNumMotionPrimitives);
  py::class_<BehaviorMPContinuousActions,
  BehaviorMotionPrimitives,
  