Core/Movement: Don't start a spline with just 1 point in FlightPathMovementGenerator

Don't start a spline with just 1 point in FlightPathMovementGenerator. This happens when teleporting to a BG while on a taxi after second last node but closer to last node.
In this case the Player will be teleported to the last node.

src/server/game/Movement/MovementGenerators/FlightPathMovementGenerator.cpp

@@ -139,11 +139,19 @@ void FlightPathMovementGenerator::DoReset(Player* player)
     player->AddUnitState(UNIT_STATE_IN_FLIGHT);
     player->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_REMOVE_CLIENT_CONTROL | UNIT_FLAG_TAXI_FLIGHT);
 
+    uint32 end = GetPathAtMapEnd();
+    uint32 currentNodeId = GetCurrentNode();
+
+    if (currentNodeId == end)
+    {
+        TC_LOG_DEBUG("movement.flightpath", "FlightPathMovementGenerator::DoReset: trying to start a flypath from the end points.");
+        return;
+    }
+
     Movement::MoveSplineInit init(player);
     // Providing an starting vertex since the taxi paths do not provide such
     init.Path().push_back(G3D::Vector3(player->GetPositionX(), player->GetPositionY(), player->GetPositionZ()));
-    uint32 end = GetPathAtMapEnd();
+    for (uint32 i = currentNodeId; i != end; ++i)
-    for (uint32 i = GetCurrentNode(); i != end; ++i)
     {
         G3D::Vector3 vertice(_path[i]->Loc.X, _path[i]->Loc.Y, _path[i]->Loc.Z);
         init.Path().push_back(vertice);