Would cause an exception because `PackageWaypoints.create(p, c)` would call `package.departure_closest_to_target()` on its turn which raises a runtime exception if no flights are present. Makes total sense when you think about it...
Fixes#66
Attempts to fix incompatibilities in save files across builds. The idea is to try and handle the incompatibility as graceful as possible, and adding more "incompatibility fixes" in the future.
