Github user soralee commented on the issue:
https://github.com/apache/zeppelin/pull/2239
@felixcheung, regarding your comment
> hey sorry, so in your screen shot here #2239 (comment)
if cancel when owner is empty it resets also writer/reader, is that a bit
odd?
that screenshot means it is reverted with old value if user click `cancel`
button.
So, it's describing that
1. original data is only `owners: admin`,
2. and change data of roles
3. and then click `cancel` button.
4. make sure data is reverted by original data (`owners: admin`)
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