## Bug description
I added an event (that exists) to an action, and now my action hangs forever.

I added an insight viewed event

w/ filters `insight == RETENTION` and `same_retention_and_cohortizing_event = false` – this appears to have broken my action where it does not load and I cannot edit it.

Cannot reproduce this same behavior locally.


## Expected behavior
- The action loads if the schema is correct.
-  If there's erroneous data it should load and let me edit it.

## How to reproduce

1. Create an action on Posthog cloud, in our main app
2. Add 'insight viewed' with filters `insight == RETENTION` and `same_retention_and_cohortizing_event = false`
3. The action will spin forever

## Environment

- [x] PostHog Cloud
- [ ] self-hosted PostHog, version/commit: _please provide_

## Additional context

[Sentry error](https://sentry.io/organizations/posthog/issues/2378948964/?project=1899813&referrer=slack)

Console errors 
<img width="1607" alt="Screen Shot 2021-05-03 at 5 45 39 PM" src="https://user-images.githubusercontent.com/5965891/116950024-b0d7a280-ac38-11eb-93c8-245390240532.png">
<img width="1167" alt="Screen Shot 2021-05-03 at 5 51 34 PM" src="https://user-images.githubusercontent.com/5965891/116950026-b208cf80-ac38-11eb-96e1-6a8f018f650a.png">



#### *Thank you* for your bug report – we love squashing them!

ee/clickhouse/models/test/test_action.py
pk = uuid4()
    kwargs.update({"event_uuid": pk})
    create_event(**kwargs)
    return Event(pk=str(pk))
def query_action(action: Action) -> Optional[List]:
    formatted_query, params = format_action_filter(action, "")
    query = ACTION_QUERY.format(action_filter=formatted_query)
    if query:
        return sync_execute(query, {"team_id": action.team_id, **params})
    return None
def _get_events_for_action(action: Action) -> List[Event]:
    events = query_action(action)
    ret = []
    if not events:
        return []
    for event in events:
        ev = Event(pk=str(event[0]))
        ev.distinct_id = event[5]
        ret.append(ev)
    return ret
def _create_person(**kwargs) -> Person:
    person = Person.objects.create(**kwargs)
    return Person(id=person.uuid)
class TestActions(
    ClickhouseTestMixin, filter_by_actions_factory(_create_event, _create_person, _get_events_for_action)  
):
    pass
class TestActionFormat(ClickhouseTestMixin, BaseTest):