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https://issues.apache.org/jira/browse/AIRFLOW-952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16436795#comment-16436795
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sam sen commented on AIRFLOW-952:
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We ran into this and I believe this PR should fix it.
[PR|https://github.com/apache/incubator-airflow/pull/3222]
> Cannot save an empty extra field via the connections UI
> --------------------------------------------------------
>
> Key: AIRFLOW-952
> URL: https://issues.apache.org/jira/browse/AIRFLOW-952
> Project: Apache Airflow
> Issue Type: Bug
> Components: models, ui
> Reporter: Vijay Bhat
> Assignee: Vijay Bhat
> Priority: Minor
>
> Once you fill out the extra field parameter in the connections web UI, you
> cannot clear it out.
> Steps to reproduce:
> - open the default mysql connection via the web UI
> - enter a JSON string for the extra field and save
> - go back to editing the mysql connection and clear out the extra field.
> - hit save, and go back to the mysql connection edit UI, and the JSON string
> will still be there.
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