dist/vue-draggable-nested-tree.es.js
function currentTreeEmpty(info) {
    return !findChild(info, info.currentTree.rootData.children, function (v) {
      return v;
    });
  }
function currentTreeEmpty(info) {
    return !findChild(info, info.currentTree.rootData.children, function (v) {
      return v;
    });
  }
当前树为空(不包括占位节点)