From ef19aec2caab1ad246fd48ba1cf7c02e05706a5d Mon Sep 17 00:00:00 2001
From: kjpc-tech <kyle@kjpc.tech>
Date: Thu, 14 May 2020 16:56:21 -0600
Subject: [3.1.x] Fixed #31590 -- Fixed ModelAdmin.date_hierarchy crash with an
 empty QuerySet.

Regression in 55cdf6c52db07f29128741b8734a523ed042e465.

Backport of 099bce1bf0b9802b7159beb9260b9b9e344bf497 from master
---
 tests/admin_views/tests.py | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'tests')

diff --git a/tests/admin_views/tests.py b/tests/admin_views/tests.py
index eb6f009f03..4d307486f1 100644
--- a/tests/admin_views/tests.py
+++ b/tests/admin_views/tests.py
@@ -969,6 +969,11 @@ class AdminViewBasicTest(AdminViewBasicTestCase):
         self.assertEqual(response.context['site_url'], '/my-site-url/')
         self.assertContains(response, '<a href="/my-site-url/">View site</a>')
 
+    def test_date_hierarchy_empty_queryset(self):
+        self.assertIs(Question.objects.exists(), False)
+        response = self.client.get(reverse('admin:admin_views_answer2_changelist'))
+        self.assertEqual(response.status_code, 200)
+
     @override_settings(TIME_ZONE='America/Sao_Paulo', USE_TZ=True)
     def test_date_hierarchy_timezone_dst(self):
         # This datetime doesn't exist in this timezone due to DST.
-- 
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