Control characters are not supported in XML 1.0

[tcitworld]

Describe the issue

Errors generating RSS feeds.

I already tried

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

Steps to reproduce the behavior

Somone accesses an RSS feed endpoint which doesn't seem to be documented according to: https://docs.weblate.org/en/weblate-5.0/api.html#rss-feeds

This one generates an error: https://weblate.framasoft.org/exports/rss/mobilizon/backend-errors/en/265973/
This one works properly: https://weblate.framasoft.org/exports/rss/mobilizon/backend-errors/en/

Issue at Sentry: https://sentry.mobilizon.org/share/issue/19a93cbf78da43d998afffff32bfcd7d/

Expected behavior

If the endpoint is indeed non existing, just 404 instead of error.

Screenshots

No response

Exception traceback

Traceback (most recent call last):
  File "/var/www/weblate/weblate-env/lib/python3.9/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "/var/www/weblate/weblate-env/lib/python3.9/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/var/www/weblate/weblate-env/lib/python3.9/site-packages/sentry_sdk/integrations/django/views.py", line 84, in sentry_wrapped_callback
    return callback(request, *args, **kwargs)
  File "/var/www/weblate/weblate-env/lib/python3.9/site-packages/django/contrib/syndication/views.py", line 48, in __call__
    feedgen.write(response, "utf-8")
  File "/var/www/weblate/weblate-env/lib/python3.9/site-packages/django/utils/feedgenerator.py", line 232, in write
    self.add_root_elements(handler)
  File "/var/www/weblate/weblate-env/lib/python3.9/site-packages/django/utils/feedgenerator.py", line 250, in add_root_elements
    handler.addQuickElement("title", self.feed["title"])
  File "/var/www/weblate/weblate-env/lib/python3.9/site-packages/django/utils/xmlutils.py", line 20, in addQuickElement
    self.characters(contents)
  File "/var/www/weblate/weblate-env/lib/python3.9/site-packages/django/utils/xmlutils.py", line 27, in characters
    raise UnserializableContentError(

Exception Type: UnserializableContentError at /exports/rss/mobilizon/backend-errors/en/265973/
Exception Value: Control characters are not supported in XML 1.0
Raised during: weblate.trans.feeds.TranslationChangesFeed

How do you run Weblate?

PyPI module

Weblate versions

• Weblate: 5.0
• Django: 4.2.2
• siphashc: 2.1
• translate-toolkit: 3.10.0
• lxml: 4.9.1
• Pillow: 9.1.0
• nh3: 0.2.8
• python-dateutil: 2.8.2
• social-auth-core: 4.3.0
• social-auth-app-django: 5.0.0
• django-crispy-forms: 2.0
• oauthlib: 3.1.1
• django-compressor: 4.3.1
• djangorestframework: 3.14.0
• django-filter: 21.1
• django-appconf: 1.0.5
• user-agents: 2.2.0
• filelock: 3.12.2
• rapidfuzz: 2.6.0
• openpyxl: 3.0.9
• celery: 5.2.3
• django-celery-beat: 2.5.0
• kombu: 5.2.3
• translation-finder: 2.15
• weblate-language-data: 2022.7
• html2text: 2020.1.16
• pycairo: 1.20.1
• PyGObject: 3.42.0
• diff-match-patch: 20230430
• requests: 2.31.0
• django-redis: 5.2.0
• hiredis: 2.0.0
• sentry-sdk: 1.29.2
• Cython: 0.29.26
• misaka: 2.1.1
• GitPython: 3.1.26
• borgbackup: 1.2.4
• pyparsing: 3.1.1
• pyahocorasick: 1.4.2
• python-redis-lock: 4.0.0
• charset-normalizer: 2.0.12
• Python: 3.9.2
• Git: 2.30.2
• psycopg2-binary: 2.9.3
• phply: 1.2.6
• ruamel.yaml: 0.17.20
• tesserocr: 2.6.1
• boto3: 1.28.36
• zeep: 4.1.0
• aeidon: 1.10.1
• iniparse: 0.5
• Mercurial: 6.4.4
• git-svn: 2.30.2
• git-review: 2.2.0
• PostgreSQL server: 13.11
• 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://localhost:6379, redis://localhost:6379, regular
• Platform: Linux 5.10.0-25-amd64 (x86_64)

Weblate deploy checks

System check identified some issues:

INFOS:
?: (weblate.I028) Backups are not configured, it is highly recommended for production use
	HINT: https://docs.weblate.org/fr/weblate-5.0/admin/backup.html

System check identified 1 issue (1 silenced).

Additional context

No response

[nijel]

Already fixed by 8a7718b.

[github-actions]

Thank you for your report; the issue you have reported has just been fixed.

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