Clear the window when all the wallets are deleted
Review Request #119728 - Created Aug. 12, 2014 and submitted
Even after deleting the last wallet, its title and icon will still be shown in the main window (see screenshots). This patch fixes this issue by hiding the widget when the wallet list is empty.
I'm not sure if it should be done here, Isn't it KPageWidget's responsibility to clean up the widget? Should this be moved to kdelibs?