docs: def next(self, task):
          """ Find the next task
  
          :param kser.sequencing.task.Task task: previous task
          :return: The next task
          :rtype: kser.sequencing.task.Task or None
          """
          uuid = str(task.uuid)
          for idx, otask in enumerate(self.tasks[:-1]):
              if otask.uuid == uuid:
                  if self.tasks[idx + 1].status != 'SUCCESS':
                      return self.tasks[idx + 1]
                  else:
                      uuid = self.tasks[idx + 1].uuid