Fixing level sparse rail generator
this closes #294 (closed) by properly computing the city radius:
Before this fix, some rails had length 0 and thus produced artifacts on the rail env. Envs where still feasible but this is better now.
this closes #294 (closed) by properly computing the city radius:
Before this fix, some rails had length 0 and thus produced artifacts on the rail env. Envs where still feasible but this is better now.