Wraps the parent class process call slightly

def preprocess(self, nb_man, resources, km=None):
        """
        Wraps the parent class process call slightly
        """
        with self.setup_preprocessor(nb_man.nb, resources, km=km):
            if self.log_output:
                self.log.info("Executing notebook with kernel: {}".format(self.kernel_name))
            nb, resources = self.papermill_process(nb_man, resources)
            info_msg = self._wait_for_reply(self.kc.kernel_info())
            nb.metadata['language_info'] = info_msg['content']['language_info']
            self.set_widgets_metadata()

        return nb, resources