OH, Ok it's still got a spindle, it's just hollow. They make little dealies that go in the hole specifically for this job, If you've a good LBS nearby they should have them for not much money.

But if you're careful you can just put a dime in there to cover the hole, then screw in your crank removal tool.
You have to make sure the dime stays centered so it doesn't impede the crank. Best done with the bike laying on its side while you're threading your remover in.