[Tutor] adding users to tweets on a list

[Saad Javed]

> ...or, better, remove the if...break and just do:
>
>     while users and len(new_message) + len(add) <= MAX_LENGTH:
>

That causes:

Enter string: These are my friends living in the same city as i am. I have
known them for years. They are good people in general. They are:
Traceback (most recent call last):
  File "chris_tweet_len.py", line 44, in <module>
    print("\n".join(generate_tweets(message, users)))
  File "chris_tweet_len.py", line 31, in generate_tweets
    while users and len(new_message) + len(add) <= MAX_LENGTH:
UnboundLocalError: local variable 'new_message' referenced before assignment

And the earlier fix now adds two users to a tweet, then one user, then two
user, then one... :(
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