Don't crash on exit after doing manual filtering.
Don't crash on exit after doing manual filtering.

svn path=/trunk/kdenetwork/kmail/; revision=126228

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