Guard save_cache() where needed #2814

Job	Run time
Cache identify	4s
Shellcheck	5s
Dependency	3s
Prepare	7s
Ruff check and force	8s
Check commit	33s
Run pytest using Python 3.13	29s
Process test coverage	20s
Run mypy	0s
Process test complexity	8s
Build and publish Python 🐍 distributions 📦 to TestPyPI	10s
	2m 7s

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