-`print` items that point to to inexistent files (e.g. a print item with field `print: "article/inexistent-file.md" `) will break the site, and will now allow to compile. This can occur when a target file was renamed, or when a file was converted to draft. Debug by removing all files of the print directory (except `_index.md`)
- **mixing draft and non draft items** in collections (e.g. issue that `has_artices: ["article/draft.md", "article/non-draft.md"`). Debug: double check that all children of non-draft items are also non-draft.
- Messing up the header (front matter) of a Markdown file: