From b43d7e1254a79a0f9995aaf29a2eb33bbda2290f Mon Sep 17 00:00:00 2001
From: zeripath <art27@cantab.net>
Date: Wed, 17 Aug 2022 23:36:56 +0100
Subject: [PATCH] Check issue labels slice length before calling xorm
 Insert(#20655) (#20836)

Backport #20655

Fix #20654

Co-authored-by: Gabriel Vasile <gabriel.vasile@email.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
---
 services/repository/template.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/services/repository/template.go b/services/repository/template.go
index a16284688b88..b73abdce587f 100644
--- a/services/repository/template.go
+++ b/services/repository/template.go
@@ -21,6 +21,11 @@ func GenerateIssueLabels(ctx context.Context, templateRepo, generateRepo *repo_m
 	if err != nil {
 		return err
 	}
+	// Prevent insert being called with an empty slice which would result in
+	// err "no element on slice when insert".
+	if len(templateLabels) == 0 {
+		return nil
+	}
 
 	newLabels := make([]*issues_model.Label, 0, len(templateLabels))
 	for _, templateLabel := range templateLabels {