移动塔的时候碰到空塔位给一个虚影，没有资源暂时return

wangguan

2020-11-09 5d16d6e5172daf42d386baa5c09663b422f05a59

 Assets/Scripts/TowerDefense/Towers/Placement/TowerPlacementGridEndless.cs

@@ -275,14 +275,23 @@
        public bool isFreeAtackPos(int x, int y)
        {
            if (m_AvailableCells[x, y])
            {
                return false;
            }

            if (m_arrGridType[x, y] == PlacementGridType.EGridOpen)
            {
                return true;
            }

            return false;
        }

        public void GetMeshRender(int x, int y, string name)
        {
            m_Tiles[x, y].gameObject.name = name;
        }

        /// <summary>
        /// 是否是等待购买的攻击塔位.
        /// </summary>