"bayke_settings"自定义配置信息注入报错

报错类型：
```
AttributeError：'Settings' object has no attribute 'SITE_HEADER'
```
原因分析：
由于项目使用了自定义的全局变量配置对象 “bayke_settings”， 项目启动后会自检该对象。该对象类型原型实例化时采用`try...except`方法来处理默认属性和自定义属性的先后问题，而先调用的 `super().__getattribute__`读取默认属性时无法读取到自定义的 `bayke_settings`，导致抛出错误。

复现方式：
在`vscode`中使用`django`的`debug`功能并启用 `Raised Exceptions` 可复现该错误：
1、在 vscode 的左侧功能栏选择 `Run and Debug (Ctrl+Shift+D) / Show all automatic debug configurations`;
2、在顶部弹出的选择下拉框中选中 `python debugger...`；
3、在顶部弹出的选择下拉框中选中 `python debugger: django`;
4、在左下角的断点选项中选中 `Raised Exceptions` 选项；
5、点击左上角的 `RUN AND DEBUG` 启动项目，诊断结果弹出以下报错：
```
Exception has occurred: AttributeError
'Settings' object has no attribute 'SITE_HEADER'
  File "D:\ProgramData\Bayke\origin\bayke-shop\baykeshop\conf\__init__.py", line 23, in __getattribute__
    return super().__getattribute__(__name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\ProgramData\Bayke\origin\bayke-shop\baykeshop\common\sites.py", line 33, in AdminSite
    site_header = gettext_lazy(bayke_settings.SITE_HEADER)
  File "D:\ProgramData\Bayke\origin\bayke-shop\baykeshop\common\sites.py", line 31, in <module>
    class AdminSite(admin.AdminSite):
  File "D:\ProgramData\Bayke\origin\bayke-shop\manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "D:\ProgramData\Bayke\origin\bayke-shop\manage.py", line 22, in <module>
    main()
AttributeError: 'Settings' object has no attribute 'SITE_HEADER'
```

baykeShop/baykeShop

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