Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/2241
Before this PR It was not default to first item in checkbox, it is default
to all items. The reason I change it to nothing is to make it consistent with
scala implementation.
Right, this would break the existing API, but I think it is worthwhile. I
have several following PRs to improve `ZeppelinContext` and hope to stabilize
it. IMO `ZeppelinContext` would play an important role for extending the rich
functionality of zeppelin.
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