text: Title: Misleading Error "Please install necessary libs for CatBoostModel."
  Body: ## 🐛 Bug Description
  
  Qlib does not require the installation of packages like `CatBoostModel`
  
  But the output looks a little misleading.
  
  
  ## To Reproduce
  Run `examples/workflow_by_code.ipynb` in jupyter notebook.
  
  ## Expected Behavior
  
  Successfully run the script without installing CatBoostModel and warning.
  
  ## Screenshot
  ![image](https://user-images.githubusercontent.com/465606/177905185-57a43596-b180-4c52-8df9-0e88b95640b4.png)
  
  <!-- A screenshot of the error message or anything shouldn't appear-->
  