Only remember the key as being warned for if we already warned for it. Fixes kolab/issue3265.
Only remember the key as being warned for if we already warned for it. Fixes kolab/issue3265.

svn path=/branches/kdepim/enterprise/kdepim/; revision=888760

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