Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1368
Thanks @krystiannowak for contribution.
I found that there is another issue for having `zeppelin-display` as a
dependency of `spark` module. Here's related issue
https://issues.apache.org/jira/browse/ZEPPELIN-1384.
To resolve ZEPPELIN-1384, i think zeppelin-display should be removed from
the dependencies section and provide alternative way to load zeppelin-display.
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