NPE: vrfentrylistener

Found in https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-1node-openstack-newton-nodl-v2-upstream-stateful-carbon/201/archives/odl1_karaf.log.gz

2017-03-16 06:24:15,640 | INFO | nPool-1-worker-2 | VpnInterfaceManager | 365 - org.opendaylight.netvirt.vpnmanager-impl - 0.4.0.SNAPSHOT | VPN WITHDRAW: Removed Fib Entry rd c2911b64-4aa0-4f6a-93ad-e90c42ee16b3 prefix 2003::/64
2017-03-16 06:24:15,641 | ERROR | eChangeHandler-0 | AsyncDataTreeChangeListenerBase | 326 - org.opendaylight.genius.mdsalutil-api - 0.2.0.SNAPSHOT | Thread terminated due to uncaught exception: AsyncDataTreeChangeListenerBase-DataTreeChangeHandler-0
java.lang.NullPointerException
at org.opendaylight.netvirt.fibmanager.VrfEntryListener.deleteLocalFibEntry(VrfEntryListener.java:1046)[367:org.opendaylight.netvirt.fibmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.fibmanager.VrfEntryListener.deleteFibEntries(VrfEntryListener.java:1509)[367:org.opendaylight.netvirt.fibmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.fibmanager.VrfEntryListener.remove(VrfEntryListener.java:250)[367:org.opendaylight.netvirt.fibmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.fibmanager.VrfEntryListener.remove(VrfEntryListener.java:142)[367:org.opendaylight.netvirt.fibmanager-impl:0.4.0.SNAPSHOT]
at org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase$DataTreeChangeHandler.run(AsyncDataTreeChangeListenerBase.java:146)[326:org.opendaylight.genius.mdsalutil-api:0.2.0.SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_121]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_121]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]