Return wheter or not a category is known by the PilotDatabase.
Return wheter or not a category is known by the PilotDatabase.

svn path=/trunk/KDE/kdepim/; revision=819166

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