Errors when there are no folders in workspace

[spelufo]

Hello, first of all, thanks for this great plugin. The issue I've been encountering is that after I empty the workspace, when I toggle it I get the following errors:

[bfabry]

Yeah... I need to write a proper guard function that wraps all of the behaviors and shorts out if there's nothing to do. Might get round to it on the w/e. Cheers for the report.