[jira] [Created] (AIRFLOW-5798) Set default to None for external_task_id in ExternalTaskSensor

[Felix Uellendall (Jira)]

Felix Uellendall created AIRFLOW-5798:
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             Summary: Set default to None for external_task_id in 
ExternalTaskSensor
                 Key: AIRFLOW-5798
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-5798
             Project: Apache Airflow
          Issue Type: Improvement
          Components: operators
    Affects Versions: 1.10.5
            Reporter: Felix Uellendall
             Fix For: 1.10.7






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