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Error if creating a new school term without a start and end date

There is an error if you want to create a new school term. You can create a school term without a start or an end date. Then it shows this: image

Traceback:

Environment:


Request Method: POST
Request URL: http://localhost:8000/django/school_terms/create/

Django Version: 4.1.5
Python Version: 3.11.1
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.sites',
 'django.contrib.staticfiles',
 'django.contrib.humanize',
 'django_uwsgi',
 'django_extensions',
 'guardian',
 'rules.apps.AutodiscoverRulesConfig',
 'haystack',
 'polymorphic',
 'dj_cleavejs.apps.DjCleaveJSConfig',
 'dbbackup',
 'django_celery_beat',
 'django_celery_results',
 'celery_progress',
 'health_check.contrib.celery',
 'djcelery_email',
 'celery_haystack',
 'sass_processor',
 'django_any_js',
 'django_yarnpkg',
 'django_vite',
 'django_tables2',
 'maintenance_mode',
 'reversion',
 'phonenumber_field',
 'django_prometheus',
 'django_select2',
 'templated_email',
 'html2text',
 'django_otp.plugins.otp_totp',
 'django_otp.plugins.otp_static',
 'django_otp',
 'otp_yubikey',
 'aleksis.core',
 'allauth',
 'allauth.account',
 'allauth.socialaccount',
 'invitations',
 'health_check',
 'health_check.db',
 'health_check.cache',
 'health_check.storage',
 'health_check.contrib.psutil',
 'health_check.contrib.migrations',
 'dynamic_preferences',
 'dynamic_preferences.users.apps.UserPreferencesConfig',
 'impersonate',
 'two_factor',
 'two_factor.plugins.phonenumber',
 'material',
 'ckeditor',
 'ckeditor_uploader',
 'colorfield',
 'django_bleach',
 'favicon',
 'django_filters',
 'oauth2_provider',
 'rest_framework',
 'graphene_django',
 'dj_iconify.apps.DjIconifyConfig',
 'cachalot',
 'django_cleanup.apps.CleanupConfig']
Installed Middleware:
['django_prometheus.middleware.PrometheusBeforeMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.middleware.http.ConditionalGetMiddleware',
 'django.contrib.sites.middleware.CurrentSiteMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django_otp.middleware.OTPMiddleware',
 'impersonate.middleware.ImpersonateMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'maintenance_mode.middleware.MaintenanceModeMiddleware',
 'aleksis.core.util.middlewares.EnsurePersonMiddleware',
 'django_prometheus.middleware.PrometheusAfterMiddleware']



Traceback (most recent call last):
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/views/generic/base.py", line 103, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/utils/decorators.py", line 46, in _wrapper
    return bound_method(*args, **kwargs)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/views/decorators/cache.py", line 62, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/contrib/auth/mixins.py", line 109, in dispatch
    return super().dispatch(request, *args, **kwargs)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/views/generic/base.py", line 142, in dispatch
    return handler(request, *args, **kwargs)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/views/generic/edit.py", line 184, in post
    return super().post(request, *args, **kwargs)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/views/generic/edit.py", line 152, in post
    if form.is_valid():
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/forms/forms.py", line 205, in is_valid
    return self.is_bound and not self.errors
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/forms/forms.py", line 200, in errors
    self.full_clean()
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/forms/forms.py", line 439, in full_clean
    self._post_clean()
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/forms/models.py", line 492, in _post_clean
    self.instance.full_clean(exclude=exclude, validate_unique=False)
  File "/home/pinguin/.cache/pypoetry/virtualenvs/aleksis-core-VVtt0ddg-py3.11/lib/python3.11/site-packages/django/db/models/base.py", line 1452, in full_clean
    self.clean()
  File "/home/pinguin/Projekte/Programmieren/AlekSIS/apps/official/AlekSIS-Core/aleksis/core/models.py", line 126, in clean
    if self.date_end < self.date_start:

Exception Type: TypeError at /django/school_terms/create/
Exception Value: '<' not supported between instances of 'NoneType' and 'NoneType'