Backport r1.48: Fix crash when wallet password prompt has been canceled.
Backport r1.48: Fix crash when wallet password prompt has been canceled.

BUG: 101847

svn path=/branches/KDE_3_4_BRANCH/kdepim/; revision=398970

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