Fixed #9125 -- When displaying errors for a form with only hidden fields, make...

                last_row = output[-1]

                # Chop off the trailing row_ender (e.g. '</td></tr>') and

                # insert the hidden fields.

                if not last_row.endswith(row_ender):

                    # This can happen in the as_p() case (and possibly others

                    # that users write): if there are only top errors, we may

                    # not be able to conscript the last row for our purposes,

                    # so insert a new, empty row.

                    last_row = normal_row % {'errors': '', 'label': '', 'field': '', 'help_text': ''}

                    output.append(last_row)

                output[-1] = last_row[:-len(row_ender)] + str_hidden + row_ender

            else:

                # If there aren't any rows in the output, just append the

True

>>> f.cleaned_data

{'data': u'xyzzy'}

A form with *only* hidden fields that has errors is going to be very unusual.

But we can try to make sure it doesn't generate invalid XHTML. In this case,

the as_p() method is the tricky one, since error lists cannot be nested

(validly) inside p elements.

>>> class HiddenForm(Form):

...     data = IntegerField(widget=HiddenInput)

>>> f = HiddenForm({})

>>> f.as_p()

u'<ul class="errorlist"><li>(Hidden field data) This field is required.</li></ul>\n<p> <input type="hidden" name="data" id="id_data" /></p>'

>>> f.as_table()

u'<tr><td colspan="2"><ul class="errorlist"><li>(Hidden field data) This field is required.</li></ul><input type="hidden" name="data" id="id_data" /></td></tr>'

"""