search_rif falla en excepción al consultar un rif malformado

Al consultar un rif (cliente/proveedor) si la cadena del rif está malformada (ej. se coloca V cuando es G, o el string es mas corto) al realizar la consulta salta una excepción.

Esto también sucede si no hay conexión contra el seniat.

Traceback (most recent call last):
  File "/home/oerp/training/6.0/server/bin/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/home/oerp/training/6.0/server/bin/service/web_services.py", line 599, in dispatch
    res = fn(db, uid, *params)
  File "/home/oerp/training/6.0/modules/audittrail/audittrail.py", line 522, in execute
    res = my_fct(db, uid, model, method, *args)
  File "/home/oerp/training/6.0/modules/audittrail/audittrail.py", line 506, in my_fct
    return fct_src(db, uid_orig, model, method, *args)
  File "/home/oerp/training/6.0/server/bin/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/oerp/training/6.0/server/bin/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/oerp/training/6.0/server/bin/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/oerp/training/6.0/modules/l10n_ve_fiscal_requirements/wizard/search_info_partner_seniat.py", line 50, in search_partner_seniat
    res = su_obj._dom_giver(url1, url2, context, aux)
  File "/home/oerp/training/6.0/modules/l10n_ve_fiscal_requirements/seniat_url.py", line 116, in _dom_giver
    dom = parseString(xml_data)
  File "/usr/lib/python2.6/xml/dom/minidom.py", line 1928, in parseString
    return expatbuilder.parseString(string)
  File "/usr/lib/python2.6/xml/dom/expatbuilder.py", line 940, in parseString
    return builder.parseString(string)
  File "/usr/lib/python2.6/xml/dom/expatbuilder.py", line 223, in parseString
    parser.Parse(string, True)
ExpatError: syntax error: line 1, column 0