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，並檢查未繫結模型的表示方式。定義缺少繫結時 middleware 的預期行為，包括錯誤結果，並在可用的情況下使用專案現有的測試進行驗證。

由索引模型根據 Issue 內容生成。