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Bugfixes
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- Do not fail when ``changelogs/fragments`` does not exist. Simply assume there are no fragments in that case.
- Improve behavior when ``changelogs/config.yaml`` is not a dictionary, or does not contain ``sections``.
- Improve error message when ``--is-collection`` is specified and ``changelogs/config.yaml`` cannot be found, or when the ``lint`` subcommand is used.