LogicalPlan.replaceAndAddSucessors produce wrong result when successors are null
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                 Key: PIG-1212
                 URL: https://issues.apache.org/jira/browse/PIG-1212
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: 0.6.0
            Reporter: Daniel Dai
            Assignee: Daniel Dai
             Fix For: 0.7.0


The following script through a NPE:

a = load '1.txt' as (a0:chararray);
b = load '2.txt' as (b0:chararray);
c = join a by a0, b by b0;
d = filter c by a0 == 'a';
explain d;

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