'Method called when an exception is raised by a job.
Simply logs the exception and rollback the transaction.
:param model_name: model name on which the job method is located.
:param method_name: name of the method to call when this job is processed.
:param args: arguments of the method (without the usual self, cr, uid).
:param job_id: job id.
:param job_exception: exception raised by the job.'

@api.model
def _handle_callback_exception(self, model_name, method_name, args, job_id, job_exception):

    self._cr.rollback()
