RHINENG-11929: return errata from db if it does not have attributes

manager/controllers/advisory_detail.go

@@ -198,6 +198,15 @@ func tryGetAdvisoryFromCache(advisoryName string) *AdvisoryDetailResponse {
 		return nil
 	}
 	middlewares.AdvisoryDetailCnt.WithLabelValues("hit").Inc()
+
+	emptyTime := time.Time{}
+	if val.Data.Attributes.PublicDate == emptyTime {
+		// advisory is found in cache but was inserted from yum_updates
+		// it is missing all attributes such as description, public_date, modified_date, etc.
+		// these attributes are added after the advisory is synced by vmaas-sync
+		// don't use the value from cache but from DB
+		return nil
+	}
 	return &val
 }