proko2 issue #240: do not crash when no addressbook accessable during sync
proko2 issue #240: do not crash when no addressbook accessable during sync

svn path=/trunk/kdepim/; revision=334966

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