Protocol can be null => fix crash
Protocol can be null
=> fix crash

svn path=/trunk/KDE/kdepim/; revision=693298

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