Fixed #21112 -- Make sure sitemaps with no lastmod date work correctly.

Thanks to Matthias Kestenholz for the report and patch.

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>

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
 

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)

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}),