show docking widget if last note gets hidden.
show docking widget if last note gets hidden.

svn path=/trunk/kdeutils/knotes/; revision=17222

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