Don't crash when there is misconfiguration residue in the foldercombobox of the Groupware config tab.
Don't crash when there is misconfiguration residue in the foldercombobox
of the Groupware config tab.

svn path=/trunk/kdepim/; revision=301068

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi