""" Ensure that users with User.email_verifications == None now have {} instead
"""

import logging
import sys
from tests.base import OsfTestCase
from tests.factories import UserFactory
from modularodm import Q
from nose.tools import *
from website import models
from website.app import init_app
from scripts import utils as scripts_utils
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

def main():
    init_app(routes=False)
    dry_run = 'dry' in sys.argv
    count = 0

    if not dry_run:
        scripts_utils.add_file_logger(logger, __file__)
    logger.info("Iterating users with None as their email_verification")
    for user in get_users_with_none_in_email_verifications():
        user.email_verifications = {}
        count += 1
        logger.info(repr(user))
        if not dry_run:
            user.save()

    print('{} users migrated'.format(count))

def get_users_with_none_in_email_verifications():
    return models.User.find( Q('email_verifications', 'eq', None))

class TestMigrateDates(OsfTestCase):
    def setUp(self):
        super(TestMigrateDates, self).setUp()
        self.user1 = UserFactory(email_verfications=None)
        self.user2 = UserFactory(email_verfications={})

    def test_migrate_none_as_email(self):
        main()
        assert_equal(self.user1.email_verifications, {})
        assert_not_equal(self.user2.email_verifications, None)


if __name__ == '__main__':
        main()

Add migration script for changing users with None as email_verifications to {}