Fix empty `layoutAssignments` #8971

Job	Run time
Build Docs	33s
Robot: No browser	32s
Unit tests: macos-latest-3.12	3m 0s
Unit tests: macos-latest-3.11	1s
Unit tests: macos-latest-3.13	2m 37s
Unit tests: SFDO-Tooling-Ubuntu-3.11	2m 29s
Unit tests: SFDO-Tooling-Ubuntu-3.13	3m 2s
Unit tests: SFDO-Tooling-Windows-3.13	5m 43s
Unit tests: SFDO-Tooling-Windows-3.11	4m 39s
Unit tests with optional dependencies: macos-latest-3.11	1s
Unit tests: SFDO-Tooling-Windows-3.12	4m 43s
Unit tests: SFDO-Tooling-Ubuntu-3.12	2m 34s
Unit tests with optional dependencies: SFDO-Tooling-Ubuntu-3.12	2m 47s
Unit tests with optional dependencies: SFDO-Tooling-Ubuntu-3.11	2m 46s
Unit tests with optional dependencies: SFDO-Tooling-Windows-3.12	6m 10s
Unit tests with optional dependencies: macos-latest-3.13	15m 4s
Unit tests with optional dependencies: SFDO-Tooling-Ubuntu-3.13	3m 52s
Unit tests with optional dependencies: macos-latest-3.12	3m 11s
Unit tests with optional dependencies: SFDO-Tooling-Windows-3.11	5m 59s
Unit tests with optional dependencies: SFDO-Tooling-Windows-3.13	6m 38s
Lint / Lint	55s
	1h 17m 16s

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