Github user asfgit closed the pull request at:
https://github.com/apache/zeppelin/pull/1697
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GitHub user anthonycorbacho opened a pull request:
https://github.com/apache/zeppelin/pull/1697
[ZEPPELIN-1352] Refactor Notebook repo versioning to return Revision Empty
instead of NULL
### What is this PR for?
In Zeppelin notebookRepo, versioning (checkpoint, get,
