PORelationToExprProject should create a NonSpillableDataBag to create empty bags

                 Key: PIG-775
                 URL: https://issues.apache.org/jira/browse/PIG-775
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.2.0
            Reporter: Pradeep Kamath
            Assignee: Pradeep Kamath
            Priority: Minor
             Fix For: 0.3.0

PORelationToExprProject currently uses "BagFactory.newDefaultBag()" to create 
an empty bag in cases where it has to send an empty bag on EOP - each such 
empty bag created will be registered with the SpillableMemoryManager as a 
spillable bag. Since it is an empty bag, it really should not be registered as 
a spillable bag. For this, NonSpillableDataBag can be used.

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