From f5f662fa5f4efd1f0fdd7901ed58c34f384af532 Mon Sep 17 00:00:00 2001
From: Simon Charette <charette.s@gmail.com>
Date: Tue, 17 Sep 2013 10:21:11 -0400
Subject: [PATCH] Fixed #21112 -- Make sure sitemaps with no lastmod date work
 correctly.

Thanks to Matthias Kestenholz for the report and patch.
---
 AUTHORS                                    |  1 +
 django/contrib/sitemaps/__init__.py        |  2 +-
 django/contrib/sitemaps/tests/test_http.py |  4 ++++
 django/contrib/sitemaps/tests/urls/http.py | 14 ++++++++++++++
 4 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/AUTHORS b/AUTHORS
index a2a0eb979a..7e620f89a6 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -338,6 +338,7 @@ answer newbie questions, and generally made Django that much better:
     Niall Kelly <duke.sam.vimes@gmail.com>
     Ryan Kelly <ryan@rfk.id.au>
     Thomas Kerpe <thomas@kerpe.net>
+    Matthias Kestenholz <mk@406.ch>
     Wiley Kestner <wiley.kestner@gmail.com>
     Ossama M. Khayat <okhayat@yahoo.com>
     Ben Khoo <khoobks@westnet.com.au>
diff --git a/django/contrib/sitemaps/__init__.py b/django/contrib/sitemaps/__init__.py
index 996e719865..fd71276be7 100644
--- a/django/contrib/sitemaps/__init__.py
+++ b/django/contrib/sitemaps/__init__.py
@@ -102,7 +102,7 @@ class Sitemap(object):
                 'priority':   str(priority if priority is not None else ''),
             }
             urls.append(url_info)
-        if all_items_lastmod:
+        if all_items_lastmod and latest_lastmod:
             self.latest_lastmod = latest_lastmod
         return urls
 
diff --git a/django/contrib/sitemaps/tests/test_http.py b/django/contrib/sitemaps/tests/test_http.py
index c870b442de..6d6862e0a6 100644
--- a/django/contrib/sitemaps/tests/test_http.py
+++ b/django/contrib/sitemaps/tests/test_http.py
@@ -166,3 +166,7 @@ class HTTPSitemapTests(SitemapTestsBase):
 
         response = self.client.get('/simple/sitemap.xml')
         self.assertEqual(response['X-Robots-Tag'], 'noindex, noodp, noarchive')
+
+    def test_empty_sitemap(self):
+        response = self.client.get('/empty/sitemap.xml')
+        self.assertEqual(response.status_code, 200)
diff --git a/django/contrib/sitemaps/tests/urls/http.py b/django/contrib/sitemaps/tests/urls/http.py
index 6721d72b81..2cadb23deb 100644
--- a/django/contrib/sitemaps/tests/urls/http.py
+++ b/django/contrib/sitemaps/tests/urls/http.py
@@ -16,6 +16,15 @@ class SimpleSitemap(Sitemap):
         return [object()]
 
 
+class EmptySitemap(Sitemap):
+    changefreq = "never"
+    priority = 0.5
+    location = '/location/'
+
+    def items(self):
+        return []
+
+
 class FixedLastmodSitemap(SimpleSitemap):
     lastmod = datetime(2013, 3, 13, 10, 0, 0)
 
@@ -37,6 +46,10 @@ simple_sitemaps = {
     'simple': SimpleSitemap,
 }
 
+empty_sitemaps = {
+    'empty': EmptySitemap,
+}
+
 fixed_lastmod_sitemaps = {
     'fixed-lastmod': FixedLastmodSitemap,
 }
@@ -62,6 +75,7 @@ urlpatterns = patterns('django.contrib.sitemaps.views',
     (r'^simple/sitemap\.xml$', 'sitemap', {'sitemaps': simple_sitemaps}),
     (r'^simple/custom-sitemap\.xml$', 'sitemap',
         {'sitemaps': simple_sitemaps, 'template_name': 'custom_sitemap.xml'}),
+    (r'^empty/sitemap\.xml$', 'sitemap', {'sitemaps': empty_sitemaps}),
     (r'^lastmod/sitemap\.xml$', 'sitemap', {'sitemaps': fixed_lastmod_sitemaps}),
     (r'^lastmod-mixed/sitemap\.xml$', 'sitemap', {'sitemaps': fixed_lastmod__mixed_sitemaps}),
     (r'^generic/sitemap\.xml$', 'sitemap', {'sitemaps': generic_sitemaps}),