PEBCAK .... and if you need to figure it out, go to
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If there is no oil in the sump, either there never was any oil in the sump from the last time it was drained (and not refilled - either partially or completely), or it has been burned and the exhaust pipes will show oil traces, or it leaked out and there will be oil traces under the vehicle.
The only other option is leprechauns .... but since you-awl are in the good ole YewSay, I think I can safely rule them out ...
So you are left with only 3 options ... and if there is no oil on the underside the car, and no trace of oil in the exhaust system, there is only one explanation .... an incompletely filled sump after the last oil change. The fact that there was no low oil pressure warning light needs to be investgated as the electrical connector from the oil pressure switch, or the oil pressure switch itself may have failed.
I would go see a member of the legal profession ..... and consult an independent mechanic to check the circuitry to the oil pressure sender and the sender itself.
The other lesson - get into the habit of a simple weekly check: 1) oil dipstick, 2) radiator water level in the overflow tank; 3) tyre pressures; 4) screen washer bottle water level; 5) brake fluid levels and 6) power steering oil reservoir ......... takes 5 minutes .... and can help avoid this sort of nightmare ....