message: Pickle bugfix
diff: @@ -241,7 +241,7 @@ void python_behavior(py::module m) {
  ParamsToPython(b.Primitive::GetParams()));
  },
  [](py::tuple t) {
  - if (t.size() != 0)
  + if (t.size() != 1)
  throw std::runtime_error("Invalid behavior model state!");
  return new PrimitiveGapKeeping(
  PythonToParams(t[0].cast<py::tuple>()));
  