postProcessor: only do all uniXXXX names if useProductionNames=True and no public.postscriptNames available
postProcessor: only do all uniXXXX names if useProductionNames=True and no public.postscriptNames available

see https://github.com/googlei18n/fontmake/issues/465#issuecomment-431335453

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