Improve _get_appliances() return logic #6047

Job	Run time
Dependency	4s
Cache identify	6s
Shellcheck	5s
Prepare	7s
Ruff check and force	10s
Check commit	23s
Run pytest using Python 3.14	16s
Run pytest using Python 3.13	22s
Run mypy	12s
Process test coverage	13s
Build and publish Python 🐍 distributions 📦 to TestPyPI	8s
Process test complexity	9s
	2m 15s

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