Debian: incorrect empty password check in postinst

# here we check to see if we can connect as root without a password

# this should catch upgrades from previous versions where the root

# password wasn't set.  if there is a password, or if the connection

# fails for any other reason, nothing happens.

if [ "$1" = "configure" ]; then

       if test_mysql_access; then

               db_input medium mysql-server/root_password || true

               db_go

               db_get mysql-server/root_password && rootpw="$RET"

               if ! set_mysql_rootpw "online"; then

                       password_error="yes"

               fi

       fi

       if [ "$password_error" = "yes" ]; then

               db_input high mysql-server/error_setting_password || true

               db_go

       fi

       # copy out any mysqld_safe settings

       systemd_conf=/etc/systemd/system/mariadb.service.d/migrated-from-my.cnf-settings.conf

       if [ -x /usr/bin/mariadb-service-convert  -a ! -f "${systemd_conf}" ]; then

              mkdir -p /etc/systemd/system/mariadb.service.d

              /usr/bin/mariadb-service-convert > "${systemd_conf}"

       fi

fi