fix(接口测试): 修复单步骤调试一直loading的缺陷

--bug=1025964 --user=王孝刚 【接口测试】新建场景-添加csv场景变量-单步骤调试失败引用csv文件失败
https://www.tapd.cn/55049933/s/1399501

api-test/frontend/src/business/automation/scenario/EditApiScenario.vue

@@ -1843,6 +1843,7 @@ export default {
             runScenario.hashTree[0].requestResult = [];
             runScenario.hashTree[0].testing = false;
           }
+          this.message = getUUID();
         }
       });
     },