don't crash when akonadi creates a calendar resource without a file behind it but then adds something to it
don't crash when akonadi creates a calendar resource without a file behind it but then adds something to it

svn path=/trunk/KDE/kdepim/; revision=901962

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