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* fix(bundler): reject non-list 'catalogs' in bundle-catalogs.yml with a clean error
_merge_config guarded only 'if not catalogs: return', so a non-empty scalar
(catalogs: 5) passed through and raised a raw 'TypeError: int object is not
iterable' from the loop below — escaping the module's BundlerError error
contract. The sibling reader of the same file (commands_impl/catalog_config.py,
used by 'bundle catalog list') already raises an actionable BundlerError for the
identical mis-shape. Add the same isinstance(list) guard so both readers of
bundle-catalogs.yml agree.
Test: 'catalogs: 5' raises BundlerError('...must be a list...') (fails before:
raw TypeError).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* fix(bundler): reject falsy non-list 'catalogs' too (is None, not falsy)
Address review: the isinstance guard sat after `if not catalogs: return`,
so falsy non-list values (`catalogs: false`, `0`, `''`, `{}`) hit the
early return and were silently accepted instead of raising the promised
BundlerError. Only an absent/None value means "nothing to merge".
Change the early return to `if catalogs is None`, mirroring the sibling
reader (commands_impl/catalog_config._read). An empty list stays valid
(the merge loop is a no-op). Add parametrized tests for the falsy
non-list cases and for the absent/empty-list no-op.
🤖 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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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>