error throws when add a tabs component

[cainiaokan]

描述问题：

error throws when add a tabs component

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'type')

截图或视频：

如何复现（请务必完整填写下面内容）：

1. 你是如何使用 amis 的？
   amis-editor

2. amis 版本是什么？请先在最新 beta 版本测试问题是否存在
   6.8.0

3. 粘贴有问题的完整 amis schema 代码：

{
  "type": "tabs",
  "tabs": [
    {
      "title": "选项卡1",
      "body": [],
      "id": "u:092f1ccaa2bc"
    },
    {
      "title": "选项卡2",
      "body": []
    }
  ],
  "mountOnEnter": true
}

4. 操作步骤
   add a tabs component in an empty page

[cainiaokan]

this bug also occurs in amis 6.7.0 but not 6.6.0 hence we can presume it was introduced in 6.7.0