Github user anthonycorbacho commented on the pull request: https://github.com/apache/zeppelin/commit/13178aee18c0a4aed1dda0c72750e08c9ed9f53c#commitcomment-20060217 In zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/repo/NotebookRepo.java: In zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/repo/NotebookRepo.java on line 141: I think we can just do `return (revision == null || EMPTY.equals(revision));` here to avoid redundancy.
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