🚨(backend) fix linter warnings

Recent updates of dev/ruff and dev/pylint dependencies led
to new linting warnings.

Pylint 3.2.0 introduced a new check `possibly-used-before-assignment`,
which ensures variables are defined regardless of conditional statements.

Some if/else branches were missing defaults. These have been fixed.

src/backend/core/tests/authentication/test_backends.py

@@ -92,9 +92,12 @@ def test_models_oidc_user_getter_invalid_token(django_assert_num_queries, monkey
 
     monkeypatch.setattr(OIDCAuthenticationBackend, "get_userinfo", get_userinfo_mocked)
 
-    with django_assert_num_queries(0), pytest.raises(
-        SuspiciousOperation,
-        match="User info contained no recognizable user identification",
+    with (
+        django_assert_num_queries(0),
+        pytest.raises(
+            SuspiciousOperation,
+            match="User info contained no recognizable user identification",
+        ),
     ):
         klass.get_or_create_user(access_token="test-token", id_token=None, payload=None)
 

src/backend/core/tests/conftest.py

@@ -1,4 +1,5 @@
 """Fixtures for tests in the Meet core application"""
+
 from unittest import mock
 
 import pytest

src/backend/core/tests/rooms/test_api_rooms_create.py

@@ -1,6 +1,7 @@
 """
 Test rooms API endpoints in the Meet core app: create.
 """
+
 import pytest
 from rest_framework.test import APIClient
 

src/backend/core/tests/rooms/test_api_rooms_delete.py

@@ -1,6 +1,7 @@
 """
 Test rooms API endpoints in the Meet core app: delete.
 """
+
 import pytest
 from rest_framework.test import APIClient
 

src/backend/core/tests/rooms/test_api_rooms_list.py

@@ -1,6 +1,7 @@
 """
 Test rooms API endpoints in the Meet core app: list.
 """
+
 from unittest import mock
 
 import pytest

src/backend/core/tests/rooms/test_api_rooms_retrieve.py

@@ -1,6 +1,7 @@
 """
 Test rooms API endpoints in the Meet core app: retrieve.
 """
+
 import random
 from unittest import mock
 

src/backend/core/tests/rooms/test_api_rooms_update.py

@@ -1,6 +1,7 @@
 """
 Test rooms API endpoints in the Meet core app: update.
 """
+
 import random
 
 import pytest

src/backend/core/tests/swagger/test_openapi_schema.py

@@ -1,6 +1,7 @@
 """
 Test suite for generated openapi schema.
 """
+
 import json
 from io import StringIO
 

src/backend/core/tests/test_api_resource_accesses.py

@@ -1,6 +1,7 @@
 """
 Test resource accesses API endpoints in the Meet core app.
 """
+
 import random
 from unittest import mock
 from uuid import uuid4

src/backend/core/tests/test_api_users.py

@@ -1,6 +1,7 @@
 """
 Test users API endpoints in the Meet core app.
 """
+
 import pytest
 from rest_framework.test import APIClient
 

src/backend/core/tests/test_models_resource_accesses.py

@@ -1,6 +1,7 @@
 """
 Unit tests for the ResourceAccess model with user
 """
+
 from django.core.exceptions import ValidationError
 
 import pytest

src/backend/core/tests/test_models_rooms.py

@@ -1,6 +1,7 @@
 """
 Unit tests for the Room model
 """
+
 from django.contrib.auth.models import AnonymousUser
 from django.core.exceptions import ValidationError
 

src/backend/core/tests/test_models_users.py

@@ -1,6 +1,7 @@
 """
 Unit tests for the User model
 """
+
 from unittest import mock
 
 from django.core.exceptions import ValidationError