ron819 opened a new pull request #3948: clear Val of Variable from the UI URL: https://github.com/apache/incubator-airflow/pull/3948 ### Jira - [ ] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW-3071) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR" - https://issues.apache.org/jira/browse/AIRFLOW-3071 - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-XXX\], code changes always need a Jira issue. ### Description Allows the user to save Variable (Key,Val) where Val is empty string.
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