code: def create_user(self, projects=None, tasks=None):
          
          projects = projects or []
          tasks = tasks or []
          dialog = UserCreatorDialog(projects=projects, tasks=tasks, parent=self)
          dialog.exec_()
          user = dialog.user
          if user:
              userdata = djitemdata.UserItemData(user)
              treemodel.TreeItem(userdata, self.users_model.root)
          return user
docs: Create and return a new user
  
          :param projects: the projects for the user
          :type projects: list of :class:`jukeboxcore.djadapter.models.Project`
          :param tasks: the tasks for the user
          :type tasks: list of :class:`jukeboxcore.djadapter.models.Task`
          :returns: The created user or None
          :rtype: None | :class:`jukeboxcore.djadapter.models.User`
          :raises: None