add - ems用电实时数据优化

op-modules/op-energy/src/main/java/com/op/energy/record/service/impl/RecordDnbInstantServiceImpl.java

@@ -148,7 +148,7 @@ public class RecordDnbInstantServiceImpl implements IRecordDnbInstantService {
             List<RecordDnbInstant> dnbInstantList = recordDnbInstantMapper.instantList(instant);
             return dnbInstantList;
         }
-        return null;
+        return new ArrayList<>();
     }
 
     /**