v0.0.4 (Beta)
Added gut-extension.discardTerminal setting: "Subsequent launches of GUT will discard the existing terminal window and create a new one. When not checked you must kill Godot manually if an error occurs."
Added the setting and defaulted to true because you can't easily kill Godot when it errors out during a run. At least with this setting you can fix the problem in your code and re-run and it will kill the existing terminal thus killing Godot.