Return the right number of messages also if the folder is closed. Fixes the number of messages which is displayed in the summary in Kontact.
Return the right number of messages also if the folder is closed. Fixes the number of messages which is displayed in the summary in Kontact.

svn path=/trunk/kdepim/; revision=318319

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