Comment 17 for bug 171007

Another small issue (testing with JazzyNico's updated version):

Replace all Fonts:
if the input field is empty, the font names are replaced with the literal string 'None'

Expected result would be:
- no font names are replaced
- or - alternatively - all font name definitions in the style attribute are removed ('Unset' -> inheritance rules) (?)
- or - alternatively - all font name definitions are reset to the default 'Sans' (?)