fix(smus): Do not call getDatabases when a catalog is an empty parent catalog #24541

Job	Run time
lint-commits	6s
lint (18.x, stable)	8m 42s
lint-duplicate-code (18.x)	58s
test Web (18.x, stable)	6m 30s
test Web (18.x, insiders)	6m 41s
test macOS (18.x, minimum, toolkit)	10m 22s
test macOS (18.x, stable, toolkit)	8m 36s
test macOS (18.x, minimum, amazonq)	11m 51s
test macOS (18.x, insiders, amazonq)	10m 9s
test Windows (18.x, stable, amazonq)	12m 17s
test Windows (18.x, insiders, amazonq)	10m 36s
test macOS (18.x, insiders, toolkit)	13m 36s
test macOS (18.x, stable, amazonq)	7m 24s
test Windows (18.x, stable, toolkit)	14m 39s
test Windows (18.x, insiders, toolkit)	14m 25s
	2h 16m 52s

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