Add some sanity checks to prevent loading crashes if readTodo/Event/Journal fails.
Add some sanity checks to prevent loading crashes if readTodo/Event/Journal fails.

svn path=/trunk/kdepim/; revision=312259

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