优化过站前核对空返回处理

src/main/java/com/uas/eis/serviceImpl/StepWorkServiceImpl.java

@@ -146,7 +146,7 @@ public class StepWorkServiceImpl implements StepWorkService {
             List<String> list = baseDao.callProcedureWithOut("CS_CHECKSTEPSNANDMACODE", new Object[]{
                     WO, stationCode,SN,""
             }, new Integer[]{1, 2, 3, 4}, new Integer[]{5, 6, 7});
-            String msg = list.get(2);
+            String msg = Objects.toString(list.get(2),"");
             if(!msg.isEmpty()){
                 return new StepWorkApiResult(false,500,"过站前核对失败:"+msg);
             }