Resolve "Review permissions"

Closes #83 (closed)

aleksis/apps/chronos/util/chronos_helpers.py

-from typing import Optional
+from typing import TYPE_CHECKING, Optional
 
 from django.db.models import Count, Q
 from django.http import HttpRequest, HttpResponseNotFound
 from django.shortcuts import get_object_or_404
 
 from guardian.core import ObjectPermissionChecker
-from typing import TYPE_CHECKING
 
 from aleksis.core.models import Group, Person
 from aleksis.core.util.predicates import check_global_permission
@@ -101,10 +100,10 @@ def get_classes(user: "User"):
                 wanted_classes.add(_class.pk)
 
         classes = classes.filter(
-            Q(pk__in=wanted_classes) | Q(members=user.person) | Q(pk=user.person.primary_group.pk)
-            if user.person.primary_group
-            else Q() | Q(owners=user.person)
+            Q(pk__in=wanted_classes) | Q(members=user.person) | Q(owners=user.person)
         )
+        if user.person.primary_group:
+            classes = classes.filter(Q(pk=user.person.primary_group.pk))
 
     return classes