Removed default value for app_configs in system check functions.

The documentation[0] encourages users to write functions without a
default for `app_configs`, and checks are always passed the argument.

[0] https://docs.djangoproject.com/en/5.2/topics/checks/

django/contrib/auth/checks.py

@@ -25,7 +25,7 @@ def _subclass_index(class_path, candidate_paths):
     return -1
 
 
-def check_user_model(app_configs=None, **kwargs):
+def check_user_model(app_configs, **kwargs):
     if app_configs is None:
         cls = apps.get_model(settings.AUTH_USER_MODEL)
     else:
@@ -121,7 +121,7 @@ def check_user_model(app_configs=None, **kwargs):
     return errors
 
 
-def check_models_permissions(app_configs=None, **kwargs):
+def check_models_permissions(app_configs, **kwargs):
     if app_configs is None:
         models = apps.get_models()
     else:

django/contrib/contenttypes/checks.py

@@ -4,7 +4,7 @@ from django.apps import apps
 from django.core.checks import Error
 
 
-def check_generic_foreign_keys(app_configs=None, **kwargs):
+def check_generic_foreign_keys(app_configs, **kwargs):
     from .fields import GenericForeignKey
 
     if app_configs is None:
@@ -25,7 +25,7 @@ def check_generic_foreign_keys(app_configs=None, **kwargs):
     return errors
 
 
-def check_model_name_lengths(app_configs=None, **kwargs):
+def check_model_name_lengths(app_configs, **kwargs):
     if app_configs is None:
         models = apps.get_models()
     else:

django/contrib/staticfiles/checks.py

@@ -8,7 +8,7 @@ E005 = Error(
 )
 
 
-def check_finders(app_configs=None, **kwargs):
+def check_finders(app_configs, **kwargs):
     """Check all registered staticfiles finders."""
     errors = []
     for finder in get_finders():
@@ -21,7 +21,7 @@ def check_finders(app_configs=None, **kwargs):
     return errors
 
 
-def check_storages(app_configs=None, **kwargs):
+def check_storages(app_configs, **kwargs):
     """Ensure staticfiles is defined in STORAGES setting."""
     errors = []
     if STATICFILES_STORAGE_ALIAS not in settings.STORAGES:

django/core/checks/model_checks.py

@@ -9,7 +9,7 @@ from django.core.checks import Error, Tags, Warning, register
 
 
 @register(Tags.models)
-def check_all_models(app_configs=None, **kwargs):
+def check_all_models(app_configs, **kwargs):
     db_table_models = defaultdict(list)
     indexes = defaultdict(list)
     constraints = defaultdict(list)
@@ -223,5 +223,5 @@ def _check_lazy_references(apps, ignore=None):
 
 
 @register(Tags.models)
-def check_lazy_references(app_configs=None, **kwargs):
+def check_lazy_references(app_configs, **kwargs):
     return _check_lazy_references(apps)