function fetchComments (store, item) {
  if (item && item.kids) {
    return store.dispatch('FETCH_ITEMS', {
      ids: item.kids
    }).then(() => Promise.all(item.kids.map(id => {
      return fetchComments(store, store.state.items[id])
    })))
  } else {         // add this
    return Promise.resolve()
  }
}