Checking if the email already exists

It checks only against verified users. Any feedback is welcome..

P.S. Since there is no parent in the `User` model there might be issues with [eventual consistency](https://developers.google.com/appengine/docs/python/datastore/structuring_for_strong_consistency) thingy but in real life situations if there is ever going to be a conflict with that.. it could be solved with a support ticket :D
Or even better.. because we know that `count` could be any of `[0, 1, 2]`

```python
if not (self_db and count):
  return not count
return count != 2 or self_db.key == user_dbs[0].key
```

Which is pretty much what you wrote actually but we want to make sure that if it's `count == 2` it should fail regardless of the `self_db...`

Correct?