the pump is fine... you just took some life off of it.
You really should try to keep it at a 1/4 of a tank... Fuel pumps use the fuel in the tank as coolant so they run much hotter when the tank is below 1/4....
but you should be fine... It's kinda like smoking...
It will die when it dies...
But, I guess if you don't have gas in the tank at all you don't have to worry????
