Airflow v2.0b3
 Kubernetes v1.19.3

Discovered issue while testing KubernetesPodOperator (haven't tested with other operator).
If I create a multiline string using """ """", add some variables inside (Jinja templating), then use this string as an argument to KubernetesPodOperator:
- In Graph View DAG is not visible (just gray area where it should be a digraph);
- in browser's web console i see the following error:

`Uncaught TypeError: node is undefined
    preProcessGraph http://localhost:8080/static/dist/dagre-d3.min.js:103
    preProcessGraph http://localhost:8080/static/dist/dagre-d3.min.js:103
    fn http://localhost:8080/static/dist/dagre-d3.min.js:103
    call http://localhost:8080/static/dist/d3.min.js:3
    draw http://localhost:8080/graph?dag_id=mydag&execution_date=mydate
    expand_group http://localhost:8080/graph?dag_id=mydag&execution_date=mydate
    <anonymous> http://localhost:8080/graph?dag_id=mydag&execution_date=mydate`

Tree view works without issues in this case. The DAG succeeds.
tests/utils/test_task_group.py
],
            },
            {'id': 'task1'},
            {'id': 'task10'},
            {'id': 'task9'},
        ],
    }
    assert sorted((e["source_id"], e["target_id"]) for e in edges) == [
        ('group_a.downstream_join_id', 'group_c.upstream_join_id'),
        ('group_a.group_b.downstream_join_id', 'group_a.task5'),
        ('group_a.group_b.task2', 'group_a.group_b.task3'),
        ('group_a.group_b.task2', 'group_a.group_b.task4'),
        ('group_a.group_b.task3', 'group_a.group_b.downstream_join_id'),
        ('group_a.group_b.task4', 'group_a.group_b.downstream_join_id'),
        ('group_a.task5', 'group_a.downstream_join_id'),
        ('group_a.task5', 'group_c.task8'),
        ('group_a.upstream_join_id', 'group_a.group_b.task2'),
        ('group_c.downstream_join_id', 'group_d.upstream_join_id'),
        ('group_c.downstream_join_id', 'task10'),
        ('group_c.downstream_join_id', 'task9'),
        ('group_c.task6', 'group_c.task8'),
        ('group_c.task7', 'group_c.task8'),
        ('group_c.task8', 'group_c.downstream_join_id'),
        ('group_c.upstream_join_id', 'group_c.task6'),
        ('group_c.upstream_join_id', 'group_c.task7'),
        ('group_d.task11', 'group_d.task12'),
        ('group_d.upstream_join_id', 'group_d.task11'),
        ('task1', 'group_a.upstream_join_id'),
    ]
def test_duplicate_group_id():