docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'dialog_node') and self.dialog_node is not None:
              _dict['dialog_node'] = self.dialog_node
          if hasattr(self, 'title') and self.title is not None:
              _dict['title'] = self.title
          if hasattr(self, 'conditions') and self.conditions is not None:
              _dict['conditions'] = self.conditions
          return _dict