It's "normal" in the sense that you just missed it going blue & then back to clear prior to shedding. I've kept many snakes for a long time...none of them ever
shed without shedding their eye-caps too, so like I said, you just looked at the wrong time, & maybe with not the right lighting. Best way to verify a snake going
blue is in a darkened room, shine a penlight beam on the eyes from the side...if they are milky, it will be obvious.
You say "it completely shed but never got eye caps." Did you actually check the shed skin, to make sure they didn't stay on? Especially since some shed is still
stuck on top of the head...you want to make sure that eye caps always came off with the shed, and also the tail tip (if shed is left on for a couple sheds, just on
the tail tip, it will result in death of tissue & loss of tail tip, because the old skin is just tight enough to cut off circulation.)