Delete on path with no data fails

after first delete on empty path we receive 404 with following error in karaf

2017-04-10 10:21:57,265 | ERROR | ult-dispatcher-4 | OneForOneStrategy | 182 - com.typesafe.akka.slf4j - 2.4.17 |
java.lang.NullPointerException
at org.opendaylight.netconf.topology.singleton.impl.tx.NetconfMasterDOMTransaction.cancel(NetconfMasterDOMTransaction.java:154)[316:org.opendaylight.netconf.topology-singleton:1.2.0.SNAPSHOT]
at org.opendaylight.netconf.topology.singleton.impl.tx.NetconfWriteOnlyTransaction.cancel(NetconfWriteOnlyTransaction.java:72)[316:org.opendaylight.netconf.topology-singleton:1.2.0.SNAPSHOT]
at org.opendaylight.netconf.topology.singleton.impl.RemoteOperationTxProcessorImpl.doCancel(RemoteOperationTxProcessorImpl.java:101)[316:org.opendaylight.netconf.topology-singleton:1.2.0.SNAPSHOT]
at org.opendaylight.netconf.topology.singleton.impl.actors.NetconfNodeActor.resolveProxyCalls(NetconfNodeActor.java:184)[316:org.opendaylight.netconf.topology-singleton:1.2.0.SNAPSHOT]
at org.opendaylight.netconf.topology.singleton.impl.actors.NetconfNodeActor.onReceive(NetconfNodeActor.java:128)[316:org.opendaylight.netconf.topology-singleton:1.2.0.SNAPSHOT]
at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)[181:com.typesafe.akka.actor:2.4.17]
at akka.actor.Actor$class.aroundReceive(Actor.scala:497)[181:com.typesafe.akka.actor:2.4.17]
at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)[181:com.typesafe.akka.actor:2.4.17]
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)[181:com.typesafe.akka.actor:2.4.17]
at akka.actor.ActorCell.invoke(ActorCell.scala:495)[181:com.typesafe.akka.actor:2.4.17]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)[181:com.typesafe.akka.actor:2.4.17]
at akka.dispatch.Mailbox.run(Mailbox.scala:224)[181:com.typesafe.akka.actor:2.4.17]
at akka.dispatch.Mailbox.exec(Mailbox.scala:234)[181:com.typesafe.akka.actor:2.4.17]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)[177:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)[177:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)[177:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)[177:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]

the next one gives me 500 with following error in karaf
2017-04-10 10:23:29,765 | ERROR | lt-dispatcher-15 | OneForOneStrategy | 182 - com.typesafe.akka.slf4j - 2.4.17 |
java.lang.NullPointerException
at org.opendaylight.netconf.topology.singleton.impl.actors.NetconfNodeActor.resolveProxyCalls(NetconfNodeActor.java:156)[316:org.opendaylight.netconf.topology-singleton:1.2.0.SNAPSHOT]
at org.opendaylight.netconf.topology.singleton.impl.actors.NetconfNodeActor.onReceive(NetconfNodeActor.java:128)[316:org.opendaylight.netconf.topology-singleton:1.2.0.SNAPSHOT]
at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)[181:com.typesafe.akka.actor:2.4.17]
at akka.actor.Actor$class.aroundReceive(Actor.scala:497)[181:com.typesafe.akka.actor:2.4.17]
at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)[181:com.typesafe.akka.actor:2.4.17]
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)[181:com.typesafe.akka.actor:2.4.17]
at akka.actor.ActorCell.invoke(ActorCell.scala:495)[181:com.typesafe.akka.actor:2.4.17]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)[181:com.typesafe.akka.actor:2.4.17]
at akka.dispatch.Mailbox.run(Mailbox.scala:224)[181:com.typesafe.akka.actor:2.4.17]
at akka.dispatch.Mailbox.exec(Mailbox.scala:234)[181:com.typesafe.akka.actor:2.4.17]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)[177:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)[177:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)[177:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)[177:org.scala-lang.scala-library:2.11.8.v20160304-115712-1706a37eb8]

and any other request will also fail. Looks like we are trying to call cancel on writeTx which is null...