Fix crash when opening raster properties on invalid layers #31744

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	18m 15s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	30m 33s
clang-tidy (22.04, 5)	5m 46s
Run tests (5, ALL_BUT_PROVIDERS)	28m 21s
Run tests (5, POSTGRES)	7m 41s
Run tests (5, HANA)	6m 11s
Run tests (6, ALL_BUT_PROVIDERS)	31m 7s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	6m 49s
	2h 14m 43s

Provide feedback