According to development posts, you need to have a certain amount of population in a system to have a valid claim so that NPRs accept it and comply with your request to leave the system. I have a system with 7 JPs, which is basically a gateway to many other portions of the galaxy, but it has no planets, and this NPR just rejected my request to leave the system. How can I claim it? Does it count if I put an orbital station there?