Fix groups with subgroups for logged-out viewers

tildes/tildes/templates/topic_listing.jinja2

@@ -108,7 +108,7 @@
   {% set is_single_group = False %}
 {% endif %}
 
-{% if is_single_group and subgroups %}
+{% if request.user and is_single_group and subgroups %}
   <div class="topic-listing-filter">
   {% if all_subgroups %}
     Includes topics from all subgroups.

tildes/tildes/views/topic.py

@@ -178,15 +178,21 @@ def get_group_topics(  # noqa
                 group for group in request.query(Group).all() if group.path != "test"
             ]
         subgroups = None
+        include_subgroups = False
     else:
         # otherwise, just topics from the single group that we're looking at
         groups = [request.context]
 
+        if request.user:
             groups.extend([
                 sub.group for sub in request.user.subscriptions
                 if sub.group.is_subgroup_of(request.context)
             ])
 
+            include_subgroups = all_subgroups
+        else:
+            include_subgroups = True
+
         subgroups = (
             request.query(Group)
             .filter(
@@ -214,9 +220,7 @@ def get_group_topics(  # noqa
     query = (
         request.query(Topic)
         .join_all_relationships()
-        .inside_groups(
-            groups, include_subgroups=not is_home_page and all_subgroups
-        )
+        .inside_groups(groups, include_subgroups=include_subgroups)
         .exclude_ignored()
         .apply_sort_option(order)
     )