possible undefined variables in upgrade.php
possible undefined variables in upgrade.php

- where name and/or password fields from the submitted form were left empty, undefined errors occurred

Signed-off-by: 6d2e3dde545cd7af2cef6a7a740bddf65bea4f7d@gmail.com
StealthWombat/SMF2.1-more-forkery,MustafaCan/SMF2.1,MustafaCan/SMF2.1,margarett/SMF2.1,georaldc/SMF2.1,mkress/SMF2.1,mkress/SMF2.1,mkress/SMF2.1,margarett/SMF2.1,StealthWombat/SMF2.1-more-forkery,georaldc/SMF2.1