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
'style': 'fill:#e8f7e4;',
                                'rx': 5,
                                'ry': 5,
                            },
                        },
                        {
                            'id': 'group234.group34.downstream_join_id',
                            'value': {
                                'label': '',
                                'labelStyle': 'fill:#000;',
                                'style': 'fill:CornflowerBlue;',
                                'shape': 'circle',
                            },
                        },
                    ],
                },
                {
                    'id': 'group234.task2',
                    'value': {
                        'label': 'task2',
                        'labelStyle': 'fill:#000;',
                        'style': 'fill:#e8f7e4;',
                        'rx': 5,
                        'ry': 5,
                    },
                },
                {
                    'id': 'group234.upstream_join_id',
                    'value': {
                        'label': '',