Fix a warning: don't set the ui sensitive if it's not yet created
Fix a warning: don't set the ui sensitive if it's not yet created

svn path=/trunk/; revision=854

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets