[1.1.X] Added force_unicode to a test (needed for Python 2.3 compatibility).

# Subclassing ErrorList #######################################################

>>> from django.utils.safestring import mark_safe

>>> from django.utils.encoding import force_unicode

>>>

>>> class TestForm(Form):

...      first_name = CharField()

...      def as_divs(self):

...          if not self: return u''

...          return mark_safe(u'<div class="error">%s</div>'

...                    % ''.join([u'<p>%s</p>' % e for e in self]))

...                    % ''.join([u'<p>%s</p>' % force_unicode(e) for e in self]))

...

This form should print errors the default way.