Fixed crash related to hierarchical todos.
Fixed crash related to hierarchical todos.

svn path=/trunk/kdepim/; revision=95526

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