Protect against an empty history in EDSM
Protect against an empty history in EDSM

andreaspada/EDDiscovery,klightspeed/EDDiscovery,EDDiscovery/EDDiscovery,klightspeed/EDDiscovery,klightspeed/EDDiscovery,EDDiscovery/EDDiscovery,EDDiscovery/EDDiscovery,andreaspada/EDDiscovery