Nebulas that have planets don't get warp point connections

Apparently you need a star in the system or something? Maybe instead of getting rid of the planets (I like cloaked planets!) we can just add a "newly forming star" type and put it in the nebula systems...

Start by reproducing the warp-point connection failure in a nebula system that contains planets, then inspect how the mod identifies valid systems for connections. Determine whether the intended result is to preserve cloaked planets while adding a newly forming star, or another fix; done means the affected nebula systems receive the expected connections without removing their planets.

Written by the indexing model from the issue text.