message: fix snap loop if the children length goes to zero
diff: @@ -144,9 +144,11 @@ export function snapMixin(BScroll) {
  this.on('destroy', () => {
  if (snap.loop) {
  let children = this.scroller.children
  + if (children.length > 2) {
  removeChild(this.scroller, children[children.length - 1])
  removeChild(this.scroller, children[0])
  }
  + }
  })
  }
  