## 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



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

ee/clickhouse/queries/trends/breakdown.py
**math_params,
            **prop_filter_params,
            **action_params,
            "event": entity.id,
            "key": filter.breakdown,
        }
        top_elements_array = []
        breakdown_filter_params = {
            "parsed_date_from": parsed_date_from,
            "parsed_date_to": parsed_date_to,
            "actions_query": "AND {}".format(action_query) if action_query else "",
            "event_filter": "AND event = %(event)s" if not action_query else "",
            "filters": prop_filters if props_to_filter else "",
        }
        if filter.breakdown_type == "cohort":
            breakdown = filter.breakdown if filter.breakdown and isinstance(filter.breakdown, list) else []
            if "all" in breakdown:
                null_sql = NULL_SQL
                breakdown_filter = BREAKDOWN_CONDITIONS_SQL
                breakdown_query = BREAKDOWN_DEFAULT_SQL
            else:
                cohort_queries, cohort_ids, cohort_params = self._format_breakdown_cohort_join_query(breakdown, team_id)
                params = {**params, "values": cohort_ids, **cohort_params}
                breakdown_filter = BREAKDOWN_COHORT_JOIN_SQL
                breakdown_filter_params = {**breakdown_filter_params, "cohort_queries": cohort_queries}
                breakdown_query = BREAKDOWN_QUERY_SQL
        elif filter.breakdown_type == "person":
            elements_query = TOP_PERSON_PROPS_ARRAY_OF_KEY_SQL.format(
                parsed_date_from=parsed_date_from,
                parsed_date_to=parsed_date_to,