From b580cffb6e498df87ad0e6f2d2f81df197773c6e Mon Sep 17 00:00:00 2001
From: Gabriel Vasile <gabriel.vasile@email.com>
Date: Thu, 4 Aug 2022 06:20:22 +0300
Subject: [PATCH] Check issue labels slice length before calling xorm
 Insert(#20655)

Backport #20655

Fix #20654

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 a16284688b885..b73abdce587f7 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 {