[FLINK-35446] Fix NPE when disabling checkpoint file merging but rest… #128

Job	Run time
Default (Java 8) / Compile	33m 16s
Pre-compile Checks / Basic QA	8m 49s
Default (Java 8) / Test packaging/licensing	32m 49s
Default (Java 8) / E2E (group 1)	2h 6m 58s
Default (Java 8) / E2E (group 2)	3h 0m 25s
Default (Java 8) / Test (module: core)	36m 38s
Default (Java 8) / Test (module: python)	30m 45s
Default (Java 8) / Test (module: table)	31m 46s
Default (Java 8) / Test (module: connect)	19m 29s
Default (Java 8) / Test (module: tests)	44m 55s
Default (Java 8) / Test (module: misc)	47m 59s
	9h 53m 49s

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