RouteGenerator: fix bug when route has no good
RouteGenerator: fix bug when route has no good

This bug was introduced in c6f3b57583d during some refactoring of the
RouteGenerator class.

hemberger/smr,smrealms/smr,hemberger/smr,smrealms/smr,hemberger/smr,smrealms/smr,hemberger/smr