Allow different location on hard drive than Skpm-Guis default location

[konki-vienna]

Describe the bug
When I setup a new Sketch plugin through Skpm GUI and choose a different local harddrive folder than the expected default - or when I import a local project from a different local hard drive folder than the expected default - Skpm GUI freeces as soon as I try to enter the plugin through the left side nav of the gui.

To Reproduce

1. Open Skpm Gui
2. Import Sketch plugin from local harddrive - different than guis default folder
3. Access plugin through left side nav of gui
4. Freeze. :(

[konki-vienna]