NullPointerException in neutronvpn

Observed in the CSIT logs:

2017-03-21 14:02:33,120 | ERROR | nPool-1-worker-3 | NeutronvpnManager | 370 - org.opendaylight.netvirt.neutronvpn-impl - 0.4.0.SNAPSHOT | Trying to update non-existing subnetmap node 783aba77-c6ab-4da6-8249-e73f0d0f7dc9
2017-03-21 14:02:33,121 | INFO | nPool-1-worker-3 | NeutronPortChangeListener | 370 - org.opendaylight.netvirt.neutronvpn-impl - 0.4.0.SNAPSHOT | Of-port-interface creation for port 506a828e-d07c-484f-a687-5bd351556a83
2017-03-21 14:02:33,138 | ERROR | eChangeHandler-0 | NatUtil | 375 - org.opendaylight.netvirt.natservice-impl - 0.4.0.SNAPSHOT | No resolution was found to GW ip IpAddress [_ipv4Address=Ipv4Address [_value=30.0.0.1]] in subnet 66a13ddd-0027-417f-bb91-2792a02edb49
2017-03-21 14:02:33,160 | ERROR | eChangeHandler-0 | SubnetmapChangeListener | 370 - org.opendaylight.netvirt.neutronvpn-impl - 0.4.0.SNAPSHOT | Notification failed because of failure in fetching elanTag from ElanInstance c62be7a9-563a-4647-9f41-f0383b04db0a config DS
java.lang.NullPointerException
at org.opendaylight.netvirt.neutronvpn.SubnetmapChangeListener.getElanTag(SubnetmapChangeListener.java:216)[370:org.opendaylight.netvirt.neutronvpn-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.neutronvpn.SubnetmapChangeListener.update(SubnetmapChangeListener.java:114)[370:org.opendaylight.netvirt.neutronvpn-impl:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.neutronvpn.SubnetmapChangeListener.update(SubnetmapChangeListener.java:34)[370:org.opendaylight.netvirt.neutronvpn-impl:0.4.0.SNAPSHOT]
at org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase$DataTreeChangeHandler.run(AsyncDataTreeChangeListenerBase.java:155)[327:org.opendaylight.genius.mdsalutil-api:0.2.0.SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_121]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_121]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_121]
2017-03-21 14:02:33,169 | ERROR | eChangeHandler-0 | SubnetmapChangeListener | 370 - org.opendaylight.netvirt.neutronvpn-impl - 0.4.0.SNAPSHOT | update:Unable to fetch elantag from ElanInstance c62be7a9-563a-4647-9f41-f0383b04db0a and hence not proceeding with subnetmapListener update for subnet 66a13ddd-0027-417f-bb91-2792a02edb49