load_records and InstalledBundleRecord.from_dict defaulted their list fields
with `data.get(...) or []` BEFORE the isinstance(list) guard, so a FALSY
non-list value (0, '', False, {}) was coerced to [] and the guard became dead
code — a corrupt .specify/bundle-records.json was silently read as "no
bundles"/"no components" instead of raising. Only an absent/None value should
mean empty.
Handle None explicitly and reject every other non-list, mirroring the merged
requires/provides/integration guards (#3629, #3661) and the catalog_config
sibling reader.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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