### 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. [ Full content available at: https://github.com/apache/incubator-airflow/pull/3948 ] This message was relayed via gitbox.apache.org for [email protected]
