Determines whether to prepare gage data from LSM

def _prepare_lsm_gag(self):
        """
        Determines whether to prepare gage data from LSM
        """
        lsm_required_vars = (self.lsm_precip_data_var,
                             self.lsm_precip_type)

        return self.lsm_input_valid and (None not in lsm_required_vars)