I misread what you were saying. Yes, I agree it happens and inertia keeps the gun rolling (no pun intended), but I still view it as a problem that needs to be fixed.
Why?
You might not always have inertia on your side. Maybe your firing from a pocket and the material is dragging on the cylinder or maybe you're trying to use the gun against someone who doesn't want you to and has grabbed the gun (but not enough to prevent you from pulling the trigger).
Yes, I know the OP was talking about slowly dryfiring an empty gun...
Chris