I wouldn't drive it in that condition...you could make the damage to the engine much worse! Head gasket leaks can behave very strangely...sometimes you only get oil in the coolant, sometimes only coolant in the oil, and sometimes both. Sometimes only overheating and burning coolant, sometimes combustion pressure enters the cooling system (popped hoses).
If there is no coolant in the sump and it's not overheating, then technically you can drive it. The problem is that coolant could enter the oil at ANY time and destroy your rod bearings.
Drive at your own risk.