清除安全检查默认检测内容序号

src/views/safetycheck/ruleManager/dialog.editPoint.vue

@@ -146,7 +146,7 @@ export default {
         areaName: null,
         businessType: null,
         remark: null,
-        sort: null
+        sort: undefined
       };
     },
     async show(index, data, isUpdate) {