Remove flair that is not visible or has been set to empty.

def clear_empty(self):
        """Remove flair that is not visible or has been set to empty."""
        for flair in self.current_flair():
            if not flair['flair_text'] and not flair['flair_css_class']:
                print(self.reddit.flair.update(flair['user']))
                print('Removed flair for {0}'.format(flair['user']))