Exception when data reuse removes all jobs.

Planner raises exception in scenarios where data reuse deletes all jobs from the workflow.

java.lang.ArrayIndexOutOfBoundsException: 1
at edu.isi.pegasus.planner.refiner.cleanup.InPlace.addCleanUpJobs(InPlace.java:109)
at edu.isi.pegasus.planner.refiner.cleanup.InPlace.addCleanupJobs(InPlace.java:67)
at edu.isi.pegasus.planner.refiner.CleanupEngine.addCleanupJobs(CleanupEngine.java:62)
at edu.isi.pegasus.planner.refiner.MainEngine.runPlanner(MainEngine.java:262)
at edu.isi.pegasus.planner.client.CPlanner.executeCommand(CPlanner.java:644)
at edu.isi.pegasus.planner.client.CPlanner.executeCommand(CPlanner.java:365)
at edu.isi.pegasus.planner.client.CPlanner.main(CPlanner.java:246)