Don't allow to remove all widgets from one side, otherwise we can't drag them back.
Don't allow to remove all widgets from one side, otherwise we can't drag them back.

svn path=/trunk/kdepim/; revision=344436

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