"FileNotFoundError" exception raised on Windows

从 install-poetry.py 中的 get_windows_path_var 开始，该函数由 display_post_message_windows 调用，并在没有管理员权限的 Windows 上重现安装程序。调查 winreg.QueryValueEx 报告的 FileNotFoundError；完成标准是安装成功完成，并且安装后消息在没有此异常的情况下显示。

Hello,

Trying the installer on Windows (for a user that does not have administrator rights) and the installation fails:

C:\Users\foo-bar>rez-env python -- python C:\Users\foo-bar\Downloads\install-poetry.py
Retrieving Poetry metadata

# Welcome to Poetry!

This will download and install the latest version of Poetry,
a dependency and package manager for Python.

It will add the `poetry` command to Poetry's bin directory, located at:

C:\Users\foo-bar\AppData\Roaming\Python\Scripts

You can uninstall at any time by executing this script with the --uninstall option,
and these changes will be reverted.

Installing Poetry (1.3.2)
Installing Poetry (1.3.2): Creating environment
Installing Poetry (1.3.2): Installing Poetry
Installing Poetry (1.3.2): Creating script
Installing Poetry (1.3.2): Done

Traceback (most recent call last):
  File "C:\Users\foo-bar\Downloads\install-poetry.py", line 940, in <module>
    sys.exit(main())
  File "C:\Users\foo-bar\Downloads\install-poetry.py", line 919, in main
    return installer.run()
  File "C:\Users\foo-bar\Downloads\install-poetry.py", line 557, in run
    self.display_post_message(version)
  File "C:\Users\foo-bar\Downloads\install-poetry.py", line 686, in display_post_message
    return self.display_post_message_windows(version)
  File "C:\Users\foo-bar\Downloads\install-poetry.py", line 694, in display_post_message_windows
    path = self.get_windows_path_var()
  File "C:\Users\foo-bar\Downloads\install-poetry.py", line 718, in get_windows_path_var
    path, _ = winreg.QueryValueEx(key, "PATH")
FileNotFoundError: [WinError 2] The system cannot find the file specified

Cheers,

Thomas