ЕШЬ ХЛЕБ, КОЛИ ПИРОГОВ НЕТ

If you cannot have something which is very good, be content with that which is worse. See Ешь щи с мясом, а нет, так и хлеб с квасом (E)

Cf:They that have no other meat bread and butter are glad to eat (Br.). They that have no other meat gladly bread and butter eat (Am.)