[Backport release-3_40] Server empty values in highlight labels parameters #36598

Job	Run time
build (24.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	28m 13s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	32m 15s
clang-tidy (24.04, 5)	7m 12s
Run tests (5, ALL_BUT_PROVIDERS)	29m 49s
Run tests (5, POSTGRES)	7m 10s
Run tests (5, HANA)	5m 52s
Run tests (6, ALL_BUT_PROVIDERS)	37m 58s
Run tests (5, ORACLE, 24.04, binary-for-oracle)	7m 3s
	2h 35m 32s

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