zjffdu opened a new pull request #3637: [ZEPPELIN-4606]. Run paragraph rest api 
cause the paragraph configuration missing after execution
URL: https://github.com/apache/zeppelin/pull/3637
 
 
   ### What is this PR for?
   This PR fix the issue by only setting config and setting when they are not 
empty. Because when invoking rest api, the paragraph config won't be passed to 
backend, in that case it would use an empty Map to override the existing 
config. 
   
   
   ### What type of PR is it?
   [Bug Fix]
   
   ### Todos
   * [ ] - Task
   
   ### What is the Jira issue?
   * https://issues.apache.org/jira/browse/ZEPPELIN-4606
   
   ### How should this be tested?
   * CI pass
   
   ### Screenshots (if appropriate)
   
   ### 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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