When you unlock Aqueduct and you don’t receive any production because the bank has run out of any resource, you should be able to select one resource of your choice. If you roll the dice and none of your tiles produce or if a tile produces but it yields nothing due to a shortage you may take any resource card of your choice from the bank.
the original wording is “”If, when the dice are rolled for production, you do not receive any resources or commodities, you may take any one resource of your choice from the bank. You may not, however, use this ability when a “7” is rolled.””