[GitHub] zeppelin issue #2239: Show dialog if owners field set to be empty on shiro

[soralee]

Github user soralee commented on the issue:

    https://github.com/apache/zeppelin/pull/2239
  
    @felixcheung I updated as your advice!
    @khalidhuseynov I added a logic which is reverted with old value if user 
cancel button like above `4 step`. How about this?
    
    > 4. then, the default owners value is disappeared.
    
    
![revert_shiro](https://cloud.githubusercontent.com/assets/8110458/25418845/bfd841d4-2a89-11e7-97d7-63e7072d0b99.gif)



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