### Body

Currently when you use multiple-outputs in decorator and it gets None value, it crashes.

As explained in https://github.com/apache/airflow/issues/32553 and workaround for ShortCircuitOperator has been implemented here:  https://github.com/apache/airflow/pull/32569 

But a more complete fix for multiple-outputs handling None is needed. 

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
return owner
        with self.dag:
            ret = test_apply_default()
        assert "owner" in ret.operator.op_kwargs
    def test_xcom_arg(self):
        """Tests that returned key in XComArg is returned correctly"""
        @task_decorator
        def add_2(number: int):
            return number + 2
        @task_decorator
        def add_num(number: int, num2: int = 2):
            return number + num2
        test_number = 10
        with self.dag:
            bigger_number = add_2(test_number)
            ret = add_num(bigger_number, XComArg(bigger_number.operator))
        dr = self.dag.create_dagrun(
            run_id=DagRunType.MANUAL,
            start_date=timezone.utcnow(),
            execution_date=DEFAULT_DATE,
            state=State.RUNNING,
        )
        bigger_number.operator.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)
        ret.operator.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)
        ti_add_num = [ti for ti in dr.get_task_instances() if ti.task_id == "add_num"][0]
        assert ti_add_num.xcom_pull(key=ret.key) == (test_number + 2) * 2
    def test_dag_task(self):