NPE during startup if initial config XML does not contain /snapshot/required-capabilities node

Exception in thread "config-pusher" java.lang.NullPointerException

at java.util.HashSet.<init>(HashSet.java:116)

at org.opendaylight.controller.netconf.persist.impl.ConfigPusher.computeNotFoundCapabilities(ConfigPusher.java:160)

at org.opendaylight.controller.netconf.persist.impl.ConfigPusher.getOperationService(ConfigPusher.java:140)

at org.opendaylight.controller.netconf.persist.impl.ConfigPusher.getOperationServiceWithRetries(ConfigPusher.java:104)

at org.opendaylight.controller.netconf.persist.impl.ConfigPusher.pushConfigWithConflictingVersionRetries(ConfigPusher.java:87)

at org.opendaylight.controller.netconf.persist.impl.ConfigPusher.pushConfigs(ConfigPusher.java:69)

at org.opendaylight.controller.netconf.persist.impl.osgi.ConfigPersisterActivator$InnerCustomizer$1.run(ConfigPersisterActivator.java:156)

at java.lang.Thread.run(Thread.java:744)