修改bug

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

@@ -49,6 +49,7 @@ import org.springframework.beans.BeanUtils;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.CollectionUtils;
 
 import java.text.DecimalFormat;
 import java.time.*;
@@ -406,7 +407,11 @@ public class WlRecordServiceImpl extends ServiceImpl<WlRecordMapper, WlRecord> i
                                 return commonQueryParam;
                             }).collect(Collectors.toList());
                             List<StatisticalDataDTO> deviceRtData = commonService.getDeviceRtDataByTime(commonQueryParams);
-                            deviceRtData.get(deviceRtData.size()-1).setValue(null);
+                            //此处设空时为了有多段时将线条断开前端显示
+                            if(!CollectionUtils.isEmpty(deviceRtData)){
+                                deviceRtData.get(deviceRtData.size()-1).setValue(null);
+
+                            }
                             List<ThdDataVO> collect1 = deviceRtData.stream().map(temp -> {
                                 ThdDataVO vo = new ThdDataVO();
                                 vo.setLineId(temp.getLineId());