Mango Shutdown - Open Point Value Web Socket Errors

[terrypacker]

Web sockets fail to close on shutdown and any point updates fail to be sent out and this log output:

ERROR 2016-10-06 12:45:05,445 (com.serotonin.m2m2.web.mvc.rest.v1.publisher.pointValue.PointValueWebSocketPublisher.pointUpdated:170) - RemoteEndpoint unavailable, current state [CLOSING], expecting [OPEN or CONNECTED]
org.eclipse.jetty.websocket.api.WebSocketException: RemoteEndpoint unavailable, current state [CLOSING], expecting [OPEN or CONNECTED]
at org.eclipse.jetty.websocket.common.WebSocketSession.getRemote(WebSocketSession.java:252)
at com.serotonin.m2m2.web.mvc.websocket.MangoWebSocketPublisher.sendMessage(MangoWebSocketPublisher.java:138)
at com.serotonin.m2m2.web.mvc.rest.v1.publisher.pointValue.PointValueWebSocketPublisher.pointUpdated(PointValueWebSocketPublisher.java:167)
at com.serotonin.m2m2.rt.dataImage.DataPointRT$EventNotifyWorkItem.execute(DataPointRT.java:613)
at com.serotonin.m2m2.rt.maint.BackgroundProcessing$1.run(BackgroundProcessing.java:54)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)