fix(smus): Do not call getDatabases when a catalog is an empty parent catalog #24536

Job	Run time
lint-commits	9s
lint (18.x, stable)	7m 37s
lint-duplicate-code (18.x)	57s
test macOS (18.x, minimum, toolkit)	11m 56s
test macOS (18.x, stable, toolkit)	12m 33s
test Web (18.x, stable)	6m 39s
test macOS (18.x, insiders, amazonq)	6m 21s
test Windows (18.x, insiders, toolkit)	16m 10s
test Windows (18.x, stable, toolkit)	15m 25s
test Windows (18.x, stable, amazonq)	10m 34s
test Web (18.x, insiders)	6m 40s
test macOS (18.x, minimum, amazonq)	11m 26s
test macOS (18.x, stable, amazonq)	12m 42s
test Windows (18.x, insiders, amazonq)	10m 34s
test macOS (18.x, insiders, toolkit)	14m 58s
	2h 24m 41s

Provide feedback