Can it fail if no types are found?

As a library author I very much like `attw` as it allows me to check if my "main" entry point is correct. However, I noticed that the `attw` CLI doesn't fail if no types are found at all. It simply states:

```bash
{
"packageName": "trading212-api",
"packageVersion": "1.0.2",
"types": false
}
```

Is there the possibility to make `attw` fail also when there are no types at all?

首先重现 trading212-api 显示的 attw CLI 结果，其中 JSON 报告 "types": false。追踪此结果在何处被转换为 CLI 结果，并检查其他失败情况是如何处理的。完成标准是：找不到任何类型时 CLI 失败，同时保留报告的结果。

由索引模型根据 Issue 内容生成。