Catch exception when they are no questions to ask

[pxg]

python post_to_twitter.py Traceback (most recent call last): File "post_to_twitter.py", line 16, in question = Question.objects.get_new_question() File "/Users/pxg/Sites/favourite_q_django/favouriteQ/questions/models.py", line 15, in get_new_question return questions[0] File "/Users/pxg/Sites/favourite_q_django/env/lib/python2.7/site-packages/django/db/models/query.py", line 207, in getitem return list(qs)[0] IndexError: list index out of range