How to return all the data if the filter is null In postgresql ?

@Query( value = "WITH conflict_values as \n" + " (SELECT coi.conflict_of_interest_flag_type, coi.flag_name, coi.conflict_of_interest_type, coi.id \n" + " FROM conflict_of_interest coi WHERE coi.university_id =:universityId)\n" + " SELECT conflict_values.flag_name as flagName,count(d.id) FROM disclosure d INNER JOIN student_profile sp on d.student_id = sp.id\n" + "\t\t\t\t\t\t AND sp.residency_status in (:residencyStatusList) AND sp.aid_status in (:financialAidStatusList) AND ((:gradYearList) IS NULL or sp.graduation_year in (:gradYearList))\n" + " INNER JOIN disclosure_conflict_of_interests dcoi \n" + " on disclosure_id = d.id AND d.updated_at > (:timePeriod) AND d.deal_type_id in (:dealTypeIdList)\n" + " RIGHT JOIN conflict_values on dcoi.conflict_of_interests_id = conflict_values.id group by flag_name order by count desc limit 5;", nativeQuery = true) List findTopDisclosureFlags( @Param("universityId") Long universityId, @Param("timePeriod") Timestamp timePeriod, @Param("residencyStatusList") List residencyStatusList, @Param("financialAidStatusList") List financialAidStatusList, @Param("dealTypeIdList") List dealTypeIdList, @Param("gradYearList") List gradYearList );