小修改

src/main/java/com/jdc/jdcproject/controller/DicekeMininglossController.java

@@ -60,7 +60,7 @@ public class DicekeMininglossController {
             System.out.println(LossByMonthVoList.toString());
             return Result.successResult().data("LossMonthVoList", LossByMonthVoList);
         } else {
-            return null;
+            return Result.errorResult().data("时间为空",null);
         }
     }