fix(ui): handle None result from COUNT query when no users match criteria

- Fix TypeError when cursor.fetchone() returns None
- Handle empty result sets gracefully
- Ensure pagination works with zero results

app.py

@@ -348,7 +348,8 @@ def user_loans():
         # We need to count distinct users matching the criteria
         count_query = f"SELECT COUNT(DISTINCT u.id) FROM users u LEFT JOIN loans l ON u.id = l.user_id AND l.status = 'active'{where_clause}{having_clause}"
         cursor.execute(count_query, params)
-        total_users = cursor.fetchone()[0]
+        result = cursor.fetchone()
+        total_users = result[0] if result else 0
         total_pages = (total_users + per_page - 1) // per_page
         
         # Build final query with pagination