修改getMonitorLayerClickMap接口,返回值里的videoId从null改成""

febs-server/gbd-demp-info/src/main/java/com/gbd/demp/info/service/impl/DeviceInfoServiceImpl.java

@@ -141,7 +141,7 @@ public class DeviceInfoServiceImpl extends ServiceImpl<DeviceInfoMapper, DeviceI
             deviceEventRespone.setIfShow(v.get(0).getIfShow());
             deviceEventRespone.setMonitorName(v.get(0).getMonitorName());
             // todo 暂时这么写
-            deviceEventRespone.setVideoId(null);
+            deviceEventRespone.setVideoId("");
             //  2、根据传感器分组
             deviceEventRespone.setMonitorValue(monitorValue);
             Map<String,List<DeviceEventVO>> sensorMap = v.stream().collect(Collectors.groupingBy(DeviceEventVO::getSensorId));