bd2019us opened a new pull request #3344: [ZEPPELIN-4102] fix bug to avoid crash URL: https://github.com/apache/zeppelin/pull/3344 ### What is this PR for? Fix (#ZEPPELIN-4102)[https://issues.apache.org/jira/browse/ZEPPELIN-4102], which changes "getJSONObject()" to "optJSONObject()" to avoid program crash. ### What type of PR is it? [Bug Fix]
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