(svn r4466) -Fix: (FS#71) Game no longer crashes when the last vehicle serving a station has been deleted.

-Negative side effect: upon loading old games, stations whose last vehicle was a station have (temporarily) lower ratings.
   -Positive side effect: station.h no longer includes vehicle.h (breaks the station.h->vehicle.h->rail.h chain)

openttd.c

@@ -1403,6 +1403,13 @@ bool AfterLoadGame(void)
 		}
 	}
 
+	if (CheckSavegameVersion(26)) {
+		Station *st;
+		FOR_ALL_STATIONS(st) {
+			st->last_vehicle_type = VEH_Invalid;
+		}
+	}
+
 	FOR_ALL_PLAYERS(p) p->avail_railtypes = GetPlayerRailtypes(p->index);
 
 	return true;