## Bug description

Trying to look at insights for feature flags no longer works (see screenshot below).

<img width="1329" alt="" src="https://user-images.githubusercontent.com/5864173/100642031-de24cb00-32fd-11eb-88b4-047c4f82124f.png">


Removing the breakdown works but then you can't see the difference between the binary values.

![image](https://user-images.githubusercontent.com/5864173/100642046-e2e97f00-32fd-11eb-8ae5-4238f899c8b8.png)


## Expected behavior

Insights should be shown as before.


## How to reproduce

1. Click on the insights link on any feature flag row.

## Environment

Cloud (Clickhouse).

## Additional context



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ee/clickhouse/queries/test/test_trends.py
from uuid import uuid4
from freezegun import freeze_time
from ee.clickhouse.models.event import create_event
from ee.clickhouse.queries.trends.clickhouse_trends import ClickhouseTrends
from ee.clickhouse.util import ClickhouseTestMixin
from posthog.models.action import Action
from posthog.models.action_step import ActionStep
from posthog.models.cohort import Cohort
from posthog.models.filter import Filter
from posthog.models.person import Person
from posthog.queries.test.test_trends import trend_test_factory
def _create_action(**kwargs):
    team = kwargs.pop("team")
    name = kwargs.pop("name")
    action = Action.objects.create(team=team, name=name)
    ActionStep.objects.create(action=action, event=name)
    return action
def _create_cohort(**kwargs):
    team = kwargs.pop("team")
    name = kwargs.pop("name")
    groups = kwargs.pop("groups")
    cohort = Cohort.objects.create(team=team, name=name, groups=groups)
    return cohort
def _create_event(**kwargs):
    kwargs.update({"event_uuid": uuid4()})
    create_event(**kwargs)
class TestClickhouseTrends(ClickhouseTestMixin, trend_test_factory(ClickhouseTrends, _create_event, Person.objects.create, _create_action, _create_cohort)):