[GitHub] [zeppelin] hsuanxyz opened a new pull request #3635: [ZEPPELIN-4568] Fix can not update output when the data is empty

[GitBox]

hsuanxyz opened a new pull request #3635: [ZEPPELIN-4568] Fix can not update 
output when the data is empty
URL: https://github.com/apache/zeppelin/pull/3635
 
 
   ### What is this PR for?
   
   Fix can not update output when the data is empty
   
   
   ### What type of PR is it?
   [Bug Fix]
   
   
   ### What is the Jira issue?
   
   https://issues.apache.org/jira/browse/ZEPPELIN-4568
   
   ### How should this be tested?
   
   Try the following code:
   
   ```pythone
   import sys
   import time
   from IPython.display import display, clear_output
   for i in range(10):
       time.sleep(0.25)
       clear_output(wait=True)
       print(i)
       sys.stdout.flush()
   ```
   
   Should be updated instead of append the output
   
   ### Screenshots (if appropriate)
   
   ![Kapture 2020-02-10 at 17 07 
46](https://user-images.githubusercontent.com/22736418/74135832-f4a34e00-4c27-11ea-9af8-9ab1f8da218d.gif)
   
   
   ### Questions:
   * Does the licenses files need update? No
   * Is there breaking changes for older versions? No 
   * Does this needs documentation? No
   

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