BspServiceMaster.checkWorkers() should return empty lists instead of null

                 Key: GIRAPH-105
             Project: Giraph
          Issue Type: Bug
    Affects Versions: 0.70.0
            Reporter: Sebastian Schelter
            Priority: Minor

BspServiceMaster.checkWorkers() is invoked in 
BspServiceMaster.coordinateSuperstep() and in 
BspServiceMaster.createInputSplits(). Both check for an empty list to fail the 
job in case something has gone wrong. However, checkWorkers() returns null in 
case of problems, causing an NPE in the calling code.

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