新增根据部门获取部门下级用户接口

pqs-prepare/prepare-boot/src/main/java/com/njcn/prepare/harmonic/service/mysql/Impl/device/DeviceAbnormaStatisticsServiceImpl.java

@@ -44,6 +44,9 @@ public class DeviceAbnormaStatisticsServiceImpl implements DeviceAbnormalStatist
         Map<String, List<AlarmPO>> deviceFlowMap  = new HashMap<>();
         // 获取所有装置以及下属监测点
         List<AlarmPO> lines = deviceAbnormaStatisticsMapper.getLines();
+        if(CollectionUtil.isEmpty(lines)){
+            return true;
+        }
         // 根据装置id分组
         Map<String, List<AlarmPO>> devMap = lines.stream().collect(Collectors.groupingBy(AlarmPO::getDeviceId));
         // 监测点集合