Fix error at shutdown on DocumentModelStatusPersister

2013-11-14 10:35:14,212 INFO  [main] [org.apache.catalina.core.StandardService] Stopping service Catalina
2013-11-14 10:35:15,297 INFO  [localhost-startStop-2] [org.quartz.core.QuartzScheduler] Scheduler Quartz_$_NON_CLUSTERED shutting down.
2013-11-14 10:35:15,297 INFO  [localhost-startStop-2] [org.quartz.core.QuartzScheduler] Scheduler Quartz_$_NON_CLUSTERED paused.
2013-11-14 10:35:15,298 INFO  [localhost-startStop-2] [org.quartz.core.QuartzScheduler] Scheduler Quartz_$_NON_CLUSTERED shutdown complete.
2013-11-14 10:35:15,304 ERROR [Nuxeo-Administrative-Statuses-Notify-Scheduler] [org.nuxeo.ecm.core.management.storage.DocumentModelStatusPersister] Error while fetching all service status for instance Linux-55e741967bd16c83543741f29ec0bc74--14bd8c5406d6120cfea750d629c1873
org.nuxeo.ecm.core.api.ClientException: java.lang.NullPointerException
	at org.nuxeo.ecm.core.api.UnrestrictedSessionRunner.runUnrestricted(UnrestrictedSessionRunner.java:153)
	at org.nuxeo.ecm.core.management.storage.DocumentModelStatusPersister.getAllStatuses(DocumentModelStatusPersister.java:239)
	at org.nuxeo.ecm.core.management.statuses.AdministrativeStatusManagerImpl.doNotifyAllStatuses(AdministrativeStatusManagerImpl.java:115)
	at org.nuxeo.ecm.core.management.statuses.AdministrativeStatusManagerImpl$NotifyStatusesHandler.run(AdministrativeStatusManagerImpl.java:126)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.NullPointerException
	at org.nuxeo.runtime.AbstractRuntimeService.getService(AbstractRuntimeService.java:279)
	at org.nuxeo.runtime.api.Framework.getLocalService(Framework.java:232)
	at org.nuxeo.runtime.api.ServiceManager.getService(ServiceManager.java:127)
	at org.nuxeo.runtime.api.Framework.getService(Framework.java:212)
	at org.nuxeo.ecm.core.api.UnrestrictedSessionRunner.runUnrestricted(UnrestrictedSessionRunner.java:133)
	... 11 more