[GitHub] liuxunorg opened a new pull request #3276: [ZEPPELIN-3928] Fix bugs AngularBind operation NullPointerException when the interpreter is not started

[GitBox]

liuxunorg opened a new pull request #3276: [ZEPPELIN-3928] Fix bugs AngularBind 
operation NullPointerException when the interpreter is not started
URL: https://github.com/apache/zeppelin/pull/3276
 
 
   ### What is this PR for?
   
   In the case where the note does not start the interpreter process, Direct 
use of the z.angularBind operation will have a null pointer exception.
   
   ### What type of PR is it?
   [Bug Fix]
   
   ### Todos
   * [x] Fix the condition for judging the interpreter process when the note is 
used for angularBind.
   * [x] Optimize the execution efficiency of the NotebookServer::onUpdate(...) 
function.
   
   ### What is the Jira issue?
   * https://issues.apache.org/jira/browse/ZEPPELIN-3928
   
   ### How should this be tested?
   [CI pass](https://travis-ci.org/liuxunorg/zeppelin/builds/473243804)
   
   ### Screenshots (if appropriate)
   
   **Before fixing BUG**
   ![alt 
text](https://github.com/liuxunorg/images/blob/master/zeppelin/angularBing-bug.gif?raw=true
 "angularBing-bug.gif")
   
   **After fixing the bug**
   ![alt 
text](https://github.com/liuxunorg/images/blob/master/zeppelin/angularBing-bugfix.gif?raw=true
 "angularBing-bugfix.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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