${workspaceFolder} expands to VSCode executable directory when no workspace folder is loaded`

[IanMatthewHuff]

Observe one of our settings such as python.dataScience.notebookFileRoot which use ${workspaceFolder} variable as a value. When you load this setting without a workspace loaded instead of undefined or empty string it provides a value for the current directory, usually the vscode exe location. This isn't the workspace directory and can throw off things trying to use these settings.

[DonJayamanne]

TODO:

• As a simple first step, we need to review existing code and understand the impact of defaulting to an empty string instead of __dirname

[rchiodo]

This should be fixed by microsoft/vscode-python#7724

[IanMatthewHuff]

validated