scripts: terminate systemd-autofs-restart.sh if saved mountpoint is missing
scripts: terminate systemd-autofs-restart.sh if saved mountpoint is missing

restore_mountpoint() should never be called without saved mountpoint.
If this happens, this is bug in script logic, which needs fixing.
https://jira.sw.ru/browse/PSBM-44207

Signed-off-by: Eugene Kolomeetz <e13ac15a30aaa8c841b369b1e0ca4d4d79ffd8cf@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

KKoukiou/criu-remote,KKoukiou/criu-remote,efiop/criu,eabatalov/criu,eabatalov/criu,efiop/criu,eabatalov/criu,eabatalov/criu,eabatalov/criu,efiop/criu,efiop/criu,efiop/criu,efiop/criu,KKoukiou/criu-remote,KKoukiou/criu-remote,KKoukiou/criu-remote,KKoukiou/criu-remote,eabatalov/criu