message: Remove redundant check for valid tile
  The if check before will already catch invalid tiles.
diff: @@ -615,7 +615,7 @@ void TileMap::AdjacentCost(void* state, std::vector<micropather::StateCost>* adj
  {
  cost = FLT_MAX;
  }
  - else if (adjacent_tile && !adjacent_tile->empty())
  + else if (!adjacent_tile->empty())
  {
  if (adjacent_tile == mPathStartEndPair.first || adjacent_tile == mPathStartEndPair.second)
  {
  