设备新增，修改是工艺字段可以为多个，修改mapper,sql

jinpengyong

2021-12-16 4450dd41e8d5828e5da4d277c86e54551a6b6c15

 screen-manage/src/main/java/com/moral/api/util/CompareFieldUtils.java

@@ -70,7 +70,7 @@
                else
                    result.setNewData(newDataObj.toString());

                if(oldDataObj==null)
                if(oldDataObj==null||oldDataObj.equals(""))
                    result.setOldData("null");
                else
                    result.setOldData(oldDataObj.toString());