As per Reinhold's suggestion, return true when some broken Reinhold code adds an incidence again that is already there.
As per Reinhold's suggestion, return true when some broken Reinhold code
adds an incidence again that is already there.

svn path=/trunk/KDE/kdepim/; revision=423690

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