579     def ajax_error_handler(self, req, ex):

   579     def ajax_error_handler(self, req, ex):

   580         req.set_header('content-type', 'application/json')

   580         req.set_header('content-type', 'application/json')

   581         status = httplib.INTERNAL_SERVER_ERROR

   581         status = httplib.INTERNAL_SERVER_ERROR

   582         if isinstance(ex, PublishException) and ex.status is not None:

   582         if isinstance(ex, PublishException) and ex.status is not None:

   583             status = ex.status

   583             status = ex.status

   585         json_dumper = getattr(ex, 'dumps', lambda : unicode(ex))

   587         json_dumper = getattr(ex, 'dumps', lambda : unicode(ex))

   586         return json_dumper()

   588         return json_dumper()

   587 

   589 

   588     # special case handling

   590     # special case handling

   589 

   591