manim movealongpath 的bug

            l = msm('leave').scale(2)
            leavepath = msm('leavepath').scale(2)
            xxp(ama(l,leavepath))

报错：

Exception: Cannot call Mobject.point_from_proportion for a Mobject with no points

需要改成：

            l = msm('leave').scale(2)
            leavepath = msm('leavepath').scale(2)
            xxp(ama(l,leavepath[0]))