Does it leak power to leave my iPhone charger disconnected while it was hooked up to my power outlet?

Does it leak power to leave my iPhone charger disconnected while it was hooked up to my power outlet?

No.

"Power leaks" don't happen with normal equipment that is working right.

Your charger consumes a small amount of power so that 5 volts is available in the USB socket at any time, then will use more when something is plugged in. You never know when a hungry phone is going to come along.