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java.lang.UnsupportedOperationException: empty.reduceLeft	at scala.collection.TraversableOnce$class.reduceLeft(TraversableOnce.scala:180)	at scala.collection.AbstractTraversable.reduceLeft(Traversable.scala:104)	at scala.collection.TraversableOnce$class.reduce(TraversableOnce.scala:208)	at scala.collection.AbstractTraversable.reduce(Traversable.scala:104)	at mesosphere.marathon.api.v2.TasksResource$$anonfun$indexJson$1$stateMachine$macro$87$1.apply(TasksResource.scala:74)	at mesosphere.marathon.api.v2.TasksResource$$anonfun$indexJson$1$stateMachine$macro$87$1.apply(TasksResource.scala:53)	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)	at scala.concurrent.impl.ExecutionContextImpl$AdaptedForkJoinTask.exec(ExecutionContextImpl.scala:121)	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:1253)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1346)	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)