fix error when active text editor does not belong to any of the workspace folders of a multiroot workspace

[bjrmatos]

Overview

When you have a multiroot workspace and the active text editor is something that does not belong to any of the workspace folders (like when you open a file directly from your desktop) you get an error Explorer Exclude: Workspace Folder Not Found. Open Folder or Workspace and try again.

Reviewer

Where should the reviewer start? How to Test? Background Context? etc ( required )

1. Open a vscode window with a multiroot workspace
2. Open the file from your desktop (like a markdown file)
3. Reload the window
4. Wait until vscode finish to startup and you should not see any error now.

Checklist

I have tested each of the following, and they work as expected: ( required )

• Meets Contributing Guide Requirements
• Pulled in the Latest Code from the develop branch
• Works on a Desktop / Laptop Device

Documentation

Screenshots, Attachments, Linked GitHub Issues, etc ( optional )

fixes #37

What GIF best describes this PR or how it makes you feel?

[bjrmatos]

seems i missed to add the Ready for Code Review tag, but I don't see how to update it now, anyway hope you see this fix 😁

[manifestinteractive]

Man, I keep finding new ways that Workspace messes things up for people. I will get a release out for this today with your fix :)