only write [Folder-*]identity-<uoid> if the identity exists.
only write [Folder-*]identity-<uoid> if the identity exists.

svn path=/trunk/kdenetwork/kmail/; revision=158013

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