🐛 [Bug]: 容器类组件，将内部组件删除后无法拖入组件

[fuzi1996]

Environment

edge 123.0.2420.65

Version

latest

Version

tiny-engine: 1.0.0-beta.4

Link to minimal reproduction

无

Step to reproduce

1.使用element-plus表单组件，然后移除ElFormItem内的输入框

2.使用TinyForm时发现移除TinyFormItem内部组件会同时移除TinyFormItem

What is expected

当容器组件内部子组件为空时，应该渲染一个可拖入的子组件

What is actually happening

当容器组件内部子组件为空时，不可拖入

What is your project name

无

Any additional comments (optional)

No response

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Title: 🐛 [Bug]: Container component, after deleting the internal component, it cannot be dragged into the component