Free up some memory when the dataproxy gets deleted.
Free up some memory when the dataproxy gets deleted.

svn path=/trunk/KDE/kdepim/; revision=819742

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