Rank by popularity when student ID is missing

app.py

@@ -222,11 +222,12 @@ G_filtered = filter_graph(G, node_threshold=node_degree_threshold, edge_threshol
 
 # Fetch rankings if student ID is provided
 rankings = {}
-if student_id:
-    content_ids = list(G_filtered.nodes)
-    rankings = get_rankings_from_api(selected_brand, int(student_id), content_ids)
-    if rankings:
-        rankings = rankings['ranked_content_ids']
+#if student_id:  # if there's no student ID, we'll just rank by popularity, 
+# i.e. each node will have a ring regardless of whether a student ID is provided
+content_ids = list(G_filtered.nodes)
+rankings = get_rankings_from_api(selected_brand, int(student_id), content_ids)
+if rankings:
+    rankings = rankings['ranked_content_ids']
 
 layers = st.slider("Depth to explore:", 1, 6, value=3)
 top_k = st.slider("Branching factor (per node):", 1, 6, value=3)