sitemap.xml exception

[QazPolma]

Describe the issue

When calling /sitemap.xml the page ends up with an exception "ValueError at /sitemap.xml" "max() arg is an empty sequence".

I already tried

• I've read and searched the documentation.
• I've searched for similar issues in this repository.

Steps to reproduce the behavior

1. Clean(initial) deploy of docker image
2. Go to /sitemap.xml

Expected behavior

Loads the page.

Screenshots

No response

Exception traceback

Environment:


Request Method: GET
Request URL: http://localhost/sitemap.xml

Django Version: 4.1.1
Python Version: 3.10.7
Installed Applications:
['customize',
 'weblate.addons',
 'weblate.auth',
 'weblate.checks',
 'weblate.formats',
 'weblate.glossary',
 'weblate.machinery',
 'weblate.trans',
 'weblate.lang',
 'weblate_language_data',
 'weblate.memory',
 'weblate.screenshots',
 'weblate.fonts',
 'weblate.accounts',
 'weblate.configuration',
 'weblate.utils',
 'weblate.vcs',
 'weblate.wladmin',
 'weblate.metrics',
 'weblate',
 'weblate.gitexport',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.admin.apps.SimpleAdminConfig',
 'django.contrib.admindocs',
 'django.contrib.sitemaps',
 'django.contrib.humanize',
 'social_django',
 'crispy_forms',
 'compressor',
 'rest_framework',
 'rest_framework.authtoken',
 'django_filters']
Installed Middleware:
['weblate.middleware.RedirectMiddleware',
 'weblate.middleware.ProxyMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'weblate.accounts.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'social_django.middleware.SocialAuthExceptionMiddleware',
 'weblate.accounts.middleware.RequireLoginMiddleware',
 'weblate.api.middleware.ThrottlingMiddleware',
 'weblate.middleware.SecurityMiddleware']



Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.10/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.10/site-packages/django/utils/decorators.py", line 133, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/django/contrib/sitemaps/views.py", line 34, in inner
    response = func(request, *args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/django/contrib/sitemaps/views.py", line 76, in index
    site_lastmod = site.get_latest_lastmod()
  File "/usr/local/lib/python3.10/site-packages/django/contrib/sitemaps/__init__.py", line 170, in get_latest_lastmod
    return max([self.lastmod(item) for item in self.items()])

Exception Type: ValueError at /sitemap.xml
Exception Value: max() arg is an empty sequence

How do you run Weblate?

Docker container

Weblate versions

• Weblate: 4.14.1
• Django: 4.1.1
• siphashc: 2.1
• translate-toolkit: 3.7.3
• lxml: 4.9.1
• Pillow: 9.2.0
• bleach: 5.0.1
• python-dateutil: 2.8.2
• social-auth-core: 4.3.0
• social-auth-app-django: 5.0.0
• django-crispy-forms: 1.14.0
• oauthlib: 3.2.1
• django-compressor: 4.1
• djangorestframework: 3.13.1
• django-filter: 22.1
• django-appconf: 1.0.5
• user-agents: 2.2.0
• filelock: 3.8.0
• rapidfuzz: 2.8.0
• openpyxl: 3.0.10
• celery: 5.2.7
• kombu: 5.2.4
• translation-finder: 2.14
• weblate-language-data: 2022.7
• html2text: 2020.1.16
• pycairo: 1.21.0
• pygobject: 3.42.2
• diff-match-patch: 20200713
• requests: 2.28.1
• django-redis: 5.2.0
• hiredis: 2.0.0
• sentry_sdk: 1.9.8
• Cython: 0.29.32
• misaka: 2.1.1
• GitPython: 3.1.27
• borgbackup: 1.2.2
• pyparsing: 3.0.9
• pyahocorasick: 1.4.4
• python-redis-lock: 3.7.0
• charset-normalizer: 2.1.1
• Python: 3.10.7
• Git: 2.30.2
• psycopg2: 2.9.3
• psycopg2-binary: 2.9.3
• phply: 1.2.5
• ruamel.yaml: 0.17.21
• tesserocr: 2.5.2
• boto3: 1.24.73
• zeep: 4.1.0
• aeidon: 1.11
• iniparse: 0.5
• mysqlclient: 2.1.1
• Mercurial: 6.2.2
• git-svn: 2.30.2
• git-review: 2.3.1
• Redis server: 6.2.7
• PostgreSQL server: 13.8
• Database backends: django.db.backends.postgresql
• Cache backends: default:RedisCache, avatar:FileBasedCache
• Email setup: django.core.mail.backends.smtp.EmailBackend: localhost
• OS encoding: filesystem=utf-8, default=utf-8
• Celery: redis://cache:6379/1, redis://cache:6379/1, regular
• Platform: Linux 5.15.0-50-generic (x86_64)

Weblate deploy checks

SystemCheckError: System check identified some issues:

CRITICALS:
?: (weblate.E003) Cannot send e-mail ([Errno 99] Cannot assign requested address), please check EMAIL_* settings.
	HINT: https://docs.weblate.org/en/weblate-4.14.1/admin/install.html#out-mail
?: (weblate.E012) The server e-mail address should be changed from its default value
	HINT: https://docs.weblate.org/en/weblate-4.14.1/admin/install.html#production-email
?: (weblate.E013) The "From" e-mail address should be changed from its default value
	HINT: https://docs.weblate.org/en/weblate-4.14.1/admin/install.html#production-email

WARNINGS:
?: (security.W004) You have not set a value for the SECURE_HSTS_SECONDS setting. If your entire site is served only over SSL, you may want to consider setting a value and enabling HTTP Strict Transport Security. Be sure to read the documentation first; enabling HSTS carelessly can cause serious, irreversible problems.
?: (security.W008) Your SECURE_SSL_REDIRECT setting is not set to True. Unless your site should be available over both SSL and non-SSL connections, you may want to either set this setting True or configure a load balancer or reverse-proxy server to redirect all connections to HTTPS.
?: (security.W012) SESSION_COOKIE_SECURE is not set to True. Using a secure-only session cookie makes it more difficult for network traffic sniffers to hijack user sessions.
?: (security.W018) You should not have DEBUG set to True in deployment.

INFOS:
?: (weblate.I021) Error collection is not set up, it is highly recommended for production use
	HINT: https://docs.weblate.org/en/weblate-4.14.1/admin/install.html#collecting-errors
?: (weblate.I028) Backups are not configured, it is highly recommended for production use
	HINT: https://docs.weblate.org/en/weblate-4.14.1/admin/backup.html

System check identified 9 issues (1 silenced).

Additional context

No response

[nijel]

This happens only as long as you have no content. I've reported this issue to Django as it's in their generic code: https://code.djangoproject.com/ticket/34088