Produits Entr'ouvert » w.c.s.

Exception:
  type = '<type 'exceptions.TypeError'>', value = 'coercing to Unicode: need string or buffer, NoneType found'

Stack trace (most recent call first):
  File "/usr/lib/python2.7/dist-packages/wcs/fields.py", line 1443, in post_conditions_export_to_xml
  1441             condition_node = ET.SubElement(conditions_node, 'post_condition')
  1442             ET.SubElement(condition_node, 'condition').text = unicode(
> 1443                     post_condition['condition'], charset, 'replace')
  1444             ET.SubElement(condition_node, 'error_message').text = unicode(
  1445                     post_condition['error_message'], charset, 'replace')

  locals:
     node = <Element 'field' at 0x776b450>
     post_condition = {'error_message': "L'inscription ne peut se faire qu'au sixi\xc3\xa8me mois de grossesse r\xc3\xa9volu.", 'condition': None}
     self = <wcs.fields.PageField object at 0x424e110>
     charset = 'utf-8'
     condition_node = <Element 'post_condition' at 0x7f2f7f78bed0>
     conditions_node = <Element 'post_conditions' at 0x776bbd0>
     include_id = True