preProcessor: process method must always return list of dicts
preProcessor: process method must always return list of dicts

not list of fonts. Downstream we expect dict type, as we call .items() method
and Font class doesn't support items().

googlefonts/ufo2ft,jamesgk/ufo2fdk,moyogo/ufo2ft,googlei18n/ufo2ft,jamesgk/ufo2ft