当网格底部有空的空间时，Bootstrap + Masonry添加空白div。

I'm using masonry + bootstrap and notice that when I have a 3-column grid then I have 10 items, it would display a 3x4 grid having 2 blank spaces at the bottom. How could I automatically add 2 empty divs at the bottom just to fill it up and not having those blank spaces? So the total div would become 12 wherein the 2 divs are just blank?I'm using masonry + bootstrap and notice that w