fix(service): 解决监测位置字段空值处理问题

- 在CsLinePOServiceImpl中对position字段进行空字符串检查，避免保存空字符串值
- 在DeviceMessageServiceImpl中增加对position字段的空值和空字符串双重判断
- 防止因空字符串导致的数据处理异常和业务逻辑错误

cs-device/cs-device-boot/src/main/java/com/njcn/csdevice/service/impl/CsLinePOServiceImpl.java

@@ -158,7 +158,7 @@ public class CsLinePOServiceImpl extends ServiceImpl<CsLinePOMapper, CsLinePO> i
         po.setClDid(param.getLineNo());
         //监测位置
         //DictData data = dicDataFeignClient.getDicDataByCode(DicDataEnum.GRID_SIDE.getCode()).getData();
-        po.setPosition(param.getPosition());
+        po.setPosition(param.getPosition().isEmpty()?null:param.getPosition());
         this.save(po);
 
         //2.新增台账树信息

cs-device/cs-device-boot/src/main/java/com/njcn/csdevice/service/impl/DeviceMessageServiceImpl.java

@@ -93,7 +93,7 @@ class DeviceMessageServiceImpl implements DeviceMessageService {
             throw new BusinessException("监测点为空");
         }
         for (CsLinePO item : lineList) {
-            if (Objects.isNull(item.getPosition())){
+            if (Objects.isNull(item.getPosition()) || item.getPosition().isEmpty()){
                 map.put(item.getClDid(),item.getLineId());
             } else {
                 DictData dictData = dicDataFeignClient.getDicDataById(item.getPosition()).getData();