[beam] 04/04: [BEAM-3876] avoid NPE if checkpoint is null in an unbounded source

[lcwik]

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commit 774ff6a5e7914df227bbcf941cd473dc5ca97972
Merge: a6536f9 cba4cac
Author: Luke Cwik <lc...@google.com>
AuthorDate: Thu Jun 7 13:17:24 2018 -0700

    [BEAM-3876] avoid NPE if checkpoint is null in an unbounded source
    
    This closes #4894

 .../direct/UnboundedReadEvaluatorFactory.java      | 29 ++++++++--
 .../direct/UnboundedReadEvaluatorFactoryTest.java  | 61 ++++++++++++++++++++++
 2 files changed, 86 insertions(+), 4 deletions(-)

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