IconsFileParser failed to parse some ttf file
generated an icon file from icoMoon, the fontBook opened it fine but iconFileParser failed to parse it. Took a while to find the problem because it failed silently.... 

Looks like the culprit is in IconsFileParser.parseFile() where it tried to get CGFont from CTFont with `CGFontCreateWithFontName(fontName)`, which returns nil so it returns without any warning...
