Fix empty `layoutAssignments` #9023

Job	Run time
Build Docs	32s
Robot: No browser	29s
Lint / Lint	1m 0s
Unit tests: macos-latest-3.13	2m 48s
Unit tests with optional dependencies: SFDO-Tooling-Windows-3.13	4m 48s
Unit tests: SFDO-Tooling-Ubuntu-3.12	2m 34s
Unit tests with optional dependencies: SFDO-Tooling-Windows-3.12	4m 50s
Unit tests: SFDO-Tooling-Ubuntu-3.13	3m 4s
Unit tests with optional dependencies: SFDO-Tooling-Ubuntu-3.11	2m 42s
Unit tests: macos-latest-3.12	2m 43s
Unit tests with optional dependencies: SFDO-Tooling-Ubuntu-3.13	3m 17s
Unit tests: SFDO-Tooling-Ubuntu-3.11	2m 33s
Unit tests with optional dependencies: macos-latest-3.13	2m 48s
Unit tests: SFDO-Tooling-Windows-3.11	4m 8s
Unit tests: SFDO-Tooling-Windows-3.13	4m 53s
Unit tests with optional dependencies: SFDO-Tooling-Windows-3.11	4m 42s
Unit tests: SFDO-Tooling-Windows-3.12	3m 43s
Unit tests with optional dependencies: macos-latest-3.11	2m 57s
Unit tests: macos-latest-3.11	2m 17s
Unit tests with optional dependencies: macos-latest-3.12	2m 38s
Unit tests with optional dependencies: SFDO-Tooling-Ubuntu-3.12	3m 2s
	1h 2m 28s

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