For use when reading existing UFOs, to comply with the specification stating that a contents.plist file must exist in a glyph set. Closes https://github.com/fonttools/fonttools/issues/2111.
For use when reading existing UFOs, to comply with the specification stating that a contents.plist file must exist in a glyph set. Closes https://github.com/fonttools/fonttools/issues/2111.