[SPARK-15869][Streaming]Fix a potential NPE in StreamingJobProgressListener.getBatchUIData#14443
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zsxwing wants to merge 1 commit intoapache:masterfrom
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[SPARK-15869][Streaming]Fix a potential NPE in StreamingJobProgressListener.getBatchUIData#14443zsxwing wants to merge 1 commit intoapache:masterfrom zsxwing:SPARK-15869
zsxwing wants to merge 1 commit intoapache:masterfrom
zsxwing:SPARK-15869
