Fix type check again

Zacqary · Zacqary · commit f9d4c0df1c96 · 2020-03-09T14:07:07.000-05:00
diff --git a/x-pack/plugins/infra/server/lib/alerting/metric_threshold/register_metric_threshold_alert_type.ts b/x-pack/plugins/infra/server/lib/alerting/metric_threshold/register_metric_threshold_alert_type.ts
@@ -43,7 +43,7 @@ const getCurrentValueFromAggregations = (aggregations: Aggregation) => {
 };
 
 const getParsedFilterQuery: (
-  filterQuery: string | Record<string, any>
+  filterQuery: string | undefined
 ) => Record<string, any> = filterQuery => {
   if (!filterQuery) return {};
   try {
