Idiomatic error handling for app/c*.go (#9423)

app/cluster_discovery.go

@@ -81,9 +81,8 @@ func (me *ClusterDiscoveryService) Stop() {
 func (a *App) IsLeader() bool {
 	if a.License() != nil && *a.Config().ClusterSettings.Enable && a.Cluster != nil {
 		return a.Cluster.IsLeader()
-	} else {
-		return true
 	}
+	return true
 }
 
 func (a *App) GetClusterId() string {