Bugfix in the ai initialization randomization procedure. Randomly

removing waypoints could cause the AIFlightPlan to run out of waypoints.
This patch prevents that by retaining at least two waypoints.

src/AIModel/AIAircraft.cxx

@@ -704,20 +704,21 @@ void FGAIAircraft::ProcessFlightPlan( double dt, time_t now )
 	    dep->getDynamics()->releaseParking(fp->getGate());
 	  }
 	// Some debug messages, specific to testing the Logical networks.
-	//if ((arr->getId() == string("EHAM")) && (prev->name  == "Center"))
-	//  {
-	//    
-	//    cerr << "Schiphol ground " 
-	//	 << trafficRef->getRegistration() << " "
-	//	 << trafficRef->getCallSign();
-	//    if (trafficRef->getHeavy())
-	//      cerr << "Heavy";
-	//    cerr << " landed runway " 
-	//	 << fp->getRunway()
-	//	 << " request taxi to gate " 
-	//	 << arr->getDynamics()->getParkingName(fp->getGate()) 
-	//	 << endl;
-	//  }
+	if ((arr->getId() == string("EHAM")) && (prev->name  == "Center"))
+	  {
+	    
+	    cerr << "Schiphol ground " 
+		 << trafficRef->getRegistration() << " "
+		 << trafficRef->getCallSign();
+	    if (trafficRef->getHeavy())
+	      cerr << "Heavy";
+	    cerr << ", arriving from " << dep->getName() ;
+	    cerr << " landed runway " 
+		 << fp->getRunway()
+		 << " request taxi to gate " 
+		 << arr->getDynamics()->getParkingName(fp->getGate()) 
+		 << endl;
+	  }
 	if (prev->name == "END")
 	  fp->setTime(trafficRef->getDepartureTime());
 	//cerr << "5" << endl;

src/AIModel/AIFlightPlanCreate.cxx

@@ -303,7 +303,9 @@ void FGAIFlightPlan::createTaxi(bool firstFlight, int direction,
 	      isPushBackPoint = true;
 	      int nrWaypoints = route.size();
 	      int nrWaypointsToSkip = rand() % nrWaypoints;
-	      for (int i = 0; i < nrWaypointsToSkip; i++) {
+	      // but make sure we always keep two active waypoints
+	      // to prevent a segmentation fault
+	      for (int i = 0; i < nrWaypointsToSkip-2; i++) {
 		isPushBackPoint = false;
 		route.next(&node);
 	      }

src/Airports/groundnetwork.hxx

@@ -124,7 +124,7 @@ public:
   bool next(int *val); 
   
   void first() { currNode = nodes.begin(); };
-  int size() { return nodes.end() - nodes.begin(); };
+  int size() { return nodes.size(); };
 };
 
 typedef vector<FGTaxiRoute> TaxiRouteVector;