スクレイピングでmecabが動きません

スクレイピングで以下のコードを動かしたいのですが、以下のエラーが出てしまいます。
もしよろしければ、ご教授お願いいたします。

fetching data... http://www.haiku-data.jp/work_detail.php?cd=9 result: SUCCESS
Traceback (most recent call last):
File "/home/yudai/Desktop/haiku_correct.py", line 52, in
for fname, word in zip(poem, morphes):
NameError: name 'poem' is not defined

# -*- coding: utf-8 -*-
import time
from urllib import request
from bs4 import BeautifulSoup
import MeCab
import codecs
import re

def get_data(url):
    req = request.urlopen(url)
    soup = BeautifulSoup(req.read(), 'html.parser')

    # 俳句
    poem_elem = soup.select('td[height=40] b')[0]
    poem = poem_elem.text.replace('*', '').strip()  # サニタイズ
    if not poem:
        return False  # 存在しないID

    return {'poem': poem}

morphes = []
MAX_ID = 10  # 登録されているIDの最大値
for i in range(1, MAX_ID):
    url = 'http://www.haiku-data.jp/work_detail.php?cd={id}'.format(id=i)
    print('fetching data... ' + url, end=' ')
    d = get_data(url)
    if d:
        print('result: SUCCESS')
        morphes.append(d)
    else:
        print('result: MISSING')

    time.sleep(1)  # アクセス間隔

def write2file(fname, sentences):
    with codecs.open(fname, 'w', 'utf-8') as f:
        f.write("".join(f, fieldnames=['poem']))

def get_morphemes(sentences):
    morphemes = []
    for sent in sentences:
        if len(sent) == 0:
            continue
        temp = tagger.parse(sent).split()
        temp.append("。\n")
        morphemes.append(" ".join(temp))
    return morphemes if morphemes else -1

tagger = MeCab.Tagger("-Owakati")

for fname, word in zip(poem, morphes):
    with req.urlopen(link + par.quote_plus(word)) as response:
        html = response.read().decode('utf-8')
        morphes = []
        for p in all_p_tag:
            # 半角文字を削除
            p = re.sub("[\s!-~]*", "", p)
            p = p.split("。")
            # 分かち書き
            morphemes = get_morphemes(p)
            if morphemes == -1:
                continue
            temp = temp + morphemes
        write2file(fname + ".txt", temp)