[FEAT] Add Input validation when choosing a directory for your repository.

[tamuseanmiller]

Is your feature request related to a problem? Please describe.
N/A

Describe the solution you'd like
When a directory is not chosen, instead of showing "There was an error cloning your repository." just make sure that the user is choosing a folder when the button is clicked.

Describe alternatives you've considered
May even use the same text validation that is used for the Repository URL validation.