Do not crash if we have no prefixes
Do not crash if we have no prefixes

svn path=/branches/KDE/3.5/kdepim/; revision=591359

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