That's the part I don't get at all. How come is not having any credit history a bad indicator? If anything, it should tell that the person is financially stable to afford things without needing credit.
Where I live (and I think in other European countries too, with exceptions) it works other way around. Having a clean credit record is a good thing and only if you neglect your payments you get negative marks on your record. Having any negative marks generally prevents you from taking any new loans or financing (a good thing!) but negative marks will be cleared after debts have been paid off and some time has passed.