https://airflow.apache.org/docs/apache-airflow/stable/configurations-ref.html#store-dag-code

![Captura de pantalla 2021-05-26 a las 17 47 56](https://user-images.githubusercontent.com/11339132/119691160-a2049a00-be4a-11eb-8f55-0ad2c6117620.png)

The Default is True or None?
tests/core/test_configuration.py
test_config = '''
[test]
key1 = hello
[new_section]
key = value
'''
        test_config_default = '''
[test]
key1 = awesome
key2 = airflow
[testsection]
key3 = value3
'''
        test_conf = AirflowConfigParser(default_config=parameterized_config(test_config_default))
        test_conf.read_string(test_config)
        assert OrderedDict([('key1', 'hello'), ('key2', 'airflow')]) == test_conf.getsection('test')
        assert OrderedDict(
            [('key3', 'value3'), ('testkey', 'testvalue'), ('testpercent', 'with%percent')]
        ) == test_conf.getsection('testsection')
        assert OrderedDict([('key', 'value')]) == test_conf.getsection('new_section')
        assert test_conf.getsection('non_existent_section') is None
    def test_get_section_should_respect_cmd_env_variable(self):