When debugger is vscode, exception at importer.py line 141

[cunnane]

          When setting `debugger = "vscode"` instead of `debugger = ""`, I still encounter the following error:

Traceback (most recent call last):
  File "D:\workspace\excel\.venv\Lib\site-packages\xloil\debug.py", line 166, in use_debugger
    debugpy_listen(**kwargs)
  File "D:\workspace\excel\.venv\Lib\site-packages\xloil\debug.py", line 56, in debugpy_listen
    addin = xloil.source_addin()
           ^^^^^^^^^^^^^^^^^^^^
  File "D:\workspace\excel\.venv\Lib\site-packages\xloil\importer.py", line 141, in source_addin
    else xloil_core.xloil_addins[addin_path]
        ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
KeyError: ''

Originally posted by @gnyuan in #114 (comment)