DRILL-8506: Ignore JSON Elements with Empty Keys #4024

Job	Run time
Run checkstyle and generate protobufs	23m 2s
Run checkstyle and generate protobufs	23m 2s
Run checkstyle and generate protobufs	23m 2s
Main Build (8, default-hadoop)	1h 9m 49s
Main Build (8, default-hadoop)	1h 6m 55s
Main Build (8, default-hadoop)	1h 6m 0s
Main Build (11, default-hadoop)	1h 23m 22s
Main Build (11, default-hadoop)	1h 23m 22s
Main Build (11, default-hadoop)	1h 23m 22s
Main Build (17, default-hadoop)	1h 12m 47s
Main Build (17, default-hadoop)	1h 12m 47s
Main Build (17, default-hadoop)	1h 12m 47s
Main Build (8, hadoop-2)	1h 7m 26s
Main Build (8, hadoop-2)	1h 4m 13s
Main Build (8, hadoop-2)	1h 4m 13s
	15h 36m 9s

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