Unknown __typename: "Event"

Searching for all threads `searchForThreads` returns events(?) as well, which is not modeled.

It should probably filter out those threads that are not mapped to a Python class (anything other than User, Group or Page)?

```
Unknown __typename: 'Event' in {'__typename': 'Event', 'url': '---', 'thread_key': None, 'is_viewer_friend': None, 'gender': None, 'all_participants': None, 'customization_info': None, 'is_group_thread': None, 'city': None, 'profile_picture': {'uri': '---'}, 'viewer_affinity': None, 'image': None, 'id': '---', 'first_name': None, 'last_name': None, 'category_type': None, 'name': '---'}
```