add error handling for cron AddFunc

ees/sql_test.go

@@ -22,7 +22,6 @@ import (
 	"fmt"
 	"reflect"
 	"testing"
-	"time"
 
 	"github.com/cgrates/cgrates/config"
 	"github.com/cgrates/cgrates/utils"
@@ -33,7 +32,10 @@ import (
 )
 
 func TestSqlGetMetrics(t *testing.T) {
-	em := utils.NewExporterMetrics("", time.Local)
+	em, err := utils.NewExporterMetrics("", "Local")
+	if err != nil {
+		t.Fatal(err)
+	}
 	sqlEe := &SQLEe{
 		em: em,
 	}