Allow WorkspacePaths
to be empty if we're not in a workspace
#2096
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We were previously adding the initial working directory as a fallback if there was no workspace. However, this led to new VS Code windows (not in a workspace) enumerating all files in the home directory (if that's what the client had to default to, without a workspace folder). And this could even spam permission requests on more secure systems such as macOS. So we just need to let be an empty enumerable.
This may resolve PowerShell/vscode-powershell#4814 and PowerShell/vscode-powershell#4821. Bug was introduced in #1995.