Add a middleware that checks if models are bound

**Is your feature request related to a problem? Please describe.**
When the model binding middleware isn't able to bind any model it will set it to null instead. And not throw any error. We need an additional middleware that checks for missing model binds.

首先定位 model binding middleware，并检查未绑定模型的表示方式。定义缺少绑定时 middleware 的预期行为，包括错误结果，并在可用的情况下使用项目现有的测试进行验证。

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