fix: Don't display dropdown border when there is no content #4855

Job	Run time
dry-run / Build browser-test-tools	3m 0s
dry-run / Build collection-hooks	47s
dry-run / Build documenter	2m 34s
dry-run / Build global-styles	30s
dry-run / Build jest-preset	29s
dry-run / Build test-utils	1m 9s
dry-run / Build component-toolkit	1m 2s
dry-run / Build theming-core	1m 15s
dry-run / Build components	1m 26s
dry-run / Build board components	0s
dry-run / Components unit tests	0s
dry-run / Components integration tests	0s
dry-run / Components accessibility tests	0s
dry-run / Demos tests	0s
	12m 12s

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