Github user asfgit closed the pull request at:
https://github.com/apache/zeppelin/pull/1080
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GitHub user prabhjyotsingh opened a pull request:
https://github.com/apache/zeppelin/pull/1080
[ZEPPELIN-1060] validate user before saving
### What is this PR for?
Zeppelin notebook permissions change has an issue while reconfiguring
permissions by clearing textbox
###
