If Lee didn't have chakra he couldn't use the 8 inner gates.
He simply doesn't have the control to produce Ninjutsu and Genjutsu.
Oh look at that another person who can't comprehend the information that is presented to them through text ,pictures AND animation.
Lee can walk on water; can release atleast 5 of 8 inner chakra gates and has about 0,5-1 points on ninjutsu and genjutsu in databook.
He has chakra.

I know Guy does but I can't remember Lee walking on water. Didn't Kakashi say it's theoretically possible to learn any jutsu once you master tree climbing, which is a prerequisite for water walking?