Only read or write the completed date if the incidence is in  fact completed. Arguably this should be caught higher up, but it can't hurt.
Only read or write the completed date if the incidence is in 
fact completed. Arguably this should be caught higher up, but
it can't hurt.

svn path=/trunk/KDE/kdepim/; revision=421697

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