[jira] [Created] (ZEPPELIN-2431) Raise Exception when remove note in folder

["CloverHearts (JIRA)" <ji...@apache.org>]

CloverHearts created ZEPPELIN-2431:
--------------------------------------

             Summary: Raise Exception when remove note in folder
                 Key: ZEPPELIN-2431
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-2431
             Project: Zeppelin
          Issue Type: Bug
            Reporter: CloverHearts
            Assignee: CloverHearts


When remove note in folder, raise exception on zeppelin server
```
ERROR [2017-04-20 18:53:56,917] ({qtp1459672753-16} NotebookServer.java[onMessage]:357) - Can't handle message
java.lang.NullPointerException
	at org.apache.zeppelin.interpreter.InterpreterSettingManager.removeInterpretersForNote(InterpreterSettingManager.java:806)
	at org.apache.zeppelin.interpreter.InterpreterSettingManager.removeNoteInterpreterSettingBinding(InterpreterSettingManager.java:895)
	at org.apache.zeppelin.notebook.Notebook.removeNote(Notebook.java:341)
	at org.apache.zeppelin.socket.NotebookServer.removeNote(NotebookServer.java:973)
	at org.apache.zeppelin.socket.NotebookServer.onMessage(NotebookServer.java:232)
	at org.apache.zeppelin.socket.NotebookSocket.onWebSocketText(NotebookSocket.java:59)
	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextMessage(JettyListenerEventDriver.java:128)
	at org.eclipse.jetty.websocket.common.message.SimpleTextMessage.messageComplete(SimpleTextMessage.java:69)
	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.appendMessage(AbstractEventDriver.java:65)
	at org.eclipse.jetty.websocket.common.events.JettyListenerEventDriver.onTextFrame(JettyListenerEventDriver.java:122)
	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.incomingFrame(AbstractEventDriver.java:161)
	at org.eclipse.jetty.websocket.common.WebSocketSession.incomingFrame(WebSocketSession.java:309)
	at org.eclipse.jetty.websocket.common.extensions.ExtensionStack.incomingFrame(ExtensionStack.java:214)
	at org.eclipse.jetty.websocket.common.Parser.notifyFrame(Parser.java:220)
	at org.eclipse.jetty.websocket.common.Parser.parse(Parser.java:258)
	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.readParse(AbstractWebSocketConnection.java:632)
	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:480)
	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:745)
```



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