Exactly that happened to me today. I haven't moved that fast in 20 odd years!
As a general rule, don't allow a pump to run dry. It may not burn it out today or tomorrow, but it will certainly reduce its sevice life.
I made a mod to my trolley. I drilled an 18mm hole in a can lid which the suction pipe goes through. I then put the pipe through the hole and tightened a jubilee clip around the pipe on the underside of the lid so it acts as a stop so the pipe now goes right down to the botom of the can and stays there.
Now, when I put a can on the trolley, the pipe is captive and held in place by a lid. It's one less worry and actually looks quite neat.