[SPARK-23330][WebUI] Spark UI SQL executions page throws NPE#20502

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jiangxb1987 wants to merge 2 commits intoapache:masterfrom jiangxb1987:executionPage

+4-2

Commits on Feb 4, 2018

fix NPE in sql executions page.
jiangxb1987
committed

Commits on Feb 5, 2018

add nonEmpty check
jiangxb1987
committed