message: nullptr_t constructor for ObjectWrapper
diff: @@ -159,6 +159,10 @@ public:
  : PolymorphicWrapper<T>(Class::getType())
  {}
  + ObjectWrapper(std::nullptr_t nullptrt)
  + : PolymorphicWrapper<T>(nullptr, Class::getType())
  + {}
  +
  ObjectWrapper(const std::shared_ptr<T>& ptr)
  : PolymorphicWrapper<T>(ptr, Class::getType())
  {}
  