--修复没有数据报错问题

zc-business/src/main/java/com/zc/business/controller/StatusController.java

@@ -4,6 +4,7 @@ import com.ruoyi.common.core.controller.BaseController;
 import com.ruoyi.common.core.domain.AjaxResult;
 import com.ruoyi.common.core.page.TableDataInfo;
 import com.ruoyi.common.enums.BusinessType;
+import com.ruoyi.common.utils.StringUtils;
 import com.ruoyi.common.utils.poi.ExcelUtil;
 import com.zc.business.domain.Status;
 import com.zc.business.service.impl.StatusService;
@@ -125,6 +126,9 @@ public class StatusController extends BaseController {
         //根据时间分组
         Map<Integer, List<Status>> map = listStatus.stream()
                 .collect(Collectors.groupingBy(Status -> Status.getTime().getHour()));
+        if(StringUtils.isEmpty(map)){
+            return AjaxResult.success("暂无数据");
+        }
         Map<Integer, List<Status>> ipMap = new TreeMap<>(map);
         Integer lastKey = Collections.max(ipMap.keySet());
         List<Status> lastEntry = ipMap.get(lastKey);