[GitHub] zeppelin issue #1093: [Bug Fix] Fix "stackedAreaChart", "lineWithFocusChart"...

[voyageth]

Github user voyageth commented on the issue:

    https://github.com/apache/zeppelin/pull/1093
  
    Oh, empty string also make wired graph too!
    This PR doesn't consider that condition.
    
    This PR can fix following condition.
    `%sh echo -e "%table key\tvalue\nnull\t1000\n1\t100\n2\t200\n99\t900"`
    
    - before apply PR
    
![asis3](https://cloud.githubusercontent.com/assets/366810/16607769/dc2c09f2-437f-11e6-93c9-c4257eb6afd6.PNG)
    - after apply PR
    
![tobe3](https://cloud.githubusercontent.com/assets/366810/16607770/dd342d34-437f-11e6-8837-295c63cffc43.PNG)
    



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