Warn when username is invalid too upon login.
Warn when username is invalid too upon login.

Tarsnap/tarsnap-gui,shinnok/tarsnap-gui,shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,codarrenvelvindron/tarsnap-gui,Tarsnap/tarsnap-gui,codarrenvelvindron/tarsnap-gui,shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,shinnok/tarsnap-gui,shinnok/tarsnap-gui