Backport: don't crash when we redirect mail and we don't have mail transporter configured
Backport: don't crash when we redirect mail and we don't have mail transporter configured

svn path=/branches/KDE/4.4/kdepim/; revision=1159465

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