Merge "font_fallback, use language prio only if id prio not set" into main

    priority = None

    if family.id:

      priority = self.priority.get('id:%s' % family.id)

    if not priority and family.lang:

    if priority is None and family.lang:

      priority = self.priority.get('lang:%s' % family.lang)

    assert priority is not None, 'Unknown priority for %s' % family