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java.lang.NullPointerException: 	at join.JoinAction$NoopLauncher.(	at join.JoinAction.checkPendingDownstream(	at join.JoinAction.downstreamFinished(	at join.JoinDependency.shouldTriggerBuild(	at hudson.tasks.BuildTrigger.execute(	at hudson.model.AbstractBuild$AbstractBuildExecution.cleanUp(	at hudson.model.Build$BuildExecution.cleanUp(	at hudson.model.Run.execute(	at	at hudson.model.ResourceController.execute(	at