Creating a "Selective Folder"-task into an empty local folder causes an error

[manuth]

Initially cells-sync tries to create a task with its local folder set to "~/Cells".
This folder logically is initially empty. When enabling "Selective Sync" and hitting "Select folder(s)" opening the dialogue an error occurrs:

Normally I would expect the client to showthe remote folders even if the local folder is empty.

One can work around this issue by creating a folder in the local directory like, for example "~/Cells/test" and then hitting "Select folder(s)" once more.