Raise a clear error for empty YAML files#1482
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romanlutz merged 5 commits intomicrosoft:mainfrom Apr 15, 2026
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romanlutz
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Mar 16, 2026
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
SeedDataset overrides the base YamlLoadable.from_yaml_file() with its own implementation that was missing the empty-YAML guard, causing a TypeError when yaml.safe_load() returns None. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Summary
YamlLoadable.from_yaml_file()with a clearValueErrorSeedDataset.from_yaml_file()andConfigurationLoader.from_yaml_file()Problem
yaml.safe_load()returnsNonefor empty or whitespace-only YAML files.YamlLoadable.from_yaml_file()currently forwards thatNoneinto downstream constructors, which surfaces as internalAttributeError/TypeErrorexceptions depending on the caller.Two real call paths affected today are
SeedDataset.from_yaml_file()andConfigurationLoader.from_yaml_file(), both of which currently fail with low-level exceptions instead of a clear validation error.Testing
.venv/bin/pytest tests/unit/models/test_seed.py tests/unit/setup/test_configuration_loader.py -q