Neverar is correct. Though you might be tempted to think shields look cool, the current mock-up is way too bright and eye-catching.
But actually I’m not sure you need the shields. It’s a hangar staffed entirely by robots. They don’t need atmosphere.
I’d agree that they’re a little to eye popping how they are, but it’s not the finished product.
I disagree that you don’t need shields. Revenge of the Sith there were shields on a ship fully staffed by droids, but they still had them. Were Qui-gon and Obi-Wan issued space suits to walk from their ship to the Trade Federation ship interior? Wookipedia also says that “Hangars which opened onto the vacuum of space were sealed by a magnetic shield and had emergency airlocks in case the shield failed”. Correct me if I’m wrong, but I can’t think of another instance in the prequels or OT where there aren’t shields in the hangar.