修改部门，去掉航道航段为必填

tuoheng-service/tuoheng-admin/src/main/java/com/tuoheng/admin/service/dept/update/UpdateDeptService.java

 
         List<RoadSectionDto> newRoadSectionList = newEditDeptRequest.getRoadSectionDtoList();
         List<Section> newSectionList = new ArrayList<>();
-        for (RoadSectionDto roadSectionDto : newRoadSectionList) {
-            newSectionList.addAll(roadSectionDto.getSectionList());
+        if (CollectionUtil.isNotEmpty(newRoadSectionList)) {
+            for (RoadSectionDto roadSectionDto : newRoadSectionList) {
+                newSectionList.addAll(roadSectionDto.getSectionList());
+            }
         }
         List<String> newSectionIdList = newSectionList.stream().map(o -> o.getId()).collect(Collectors.toList());