This brings up an interesting point. Without a sun, any planet in that system just carries on along its trajectory. I'm not sure how feasible it is to hyperjump to systems without a sun - could be much more difficult and dangerous. Not to mention that anybody trying to find the rogue planet - and land on it - has to do so in complete darkness.
It would continue on the trajectory it had when the sun disappeared. In other words, it would wander away from its original orbit, making it nearly impossible to find.
Of course, this is Star Wars . Star Wars eats impossible for breakfast.