Fix bug 141016.
Fix bug 141016.

QString::isNull() does not behave the same in Qt 4 as it did with Qt 3, and so
the password string was never null but it was empty.

BUG: 141016


svn path=/trunk/KDE/kdenetwork/kopete/; revision=758161

josh-wambua/kopete,Jtalk/kopete-fork-xep0136,josh-wambua/kopete,josh-wambua/kopete,josh-wambua/kopete,Jtalk/kopete-fork-xep0136,Jtalk/kopete-fork-xep0136,Jtalk/kopete-fork-xep0136,josh-wambua/kopete,Jtalk/kopete-fork-xep0136,josh-wambua/kopete,Jtalk/kopete-fork-xep0136,josh-wambua/kopete