If you are referring to the Tie/D it does have shields.
I stand corrected, I figured that all of the power from the engines was routed to the thrusters and laser cannons, with none to pressurization (<- this first one I know to be true, since the TIE pilots wear masks and breathing apparatus) and shields. On the other hand though, there
are three wings on that, so you could squeeze in a shield generator somewhere in there.
-Penguin