Handle errors instead of trying to open in default text editor

[rahulakrishna]

In my use case, I have a dropdown for the user to select a particular editor and open file in that.

But if that fails, launch-editor does not show any error. It silently fails and tries to open the file in the default text-editor.

This needs to be optional. Trying to open the file in "Sublime Text" and it opening up in "VS Code" does not suit every use case.