Fixes #4593: Fix AttributeError exception when viewing object lists as a non-authenticated user

netbox/templates/utilities/obj_list.html

@@ -5,7 +5,7 @@
 {% block content %}
 <div class="pull-right noprint">
     {% block buttons %}{% endblock %}
-    {% if table_config_form %}
+    {% if request.user.is_authenticated and table_config_form %}
         <button type="button" class="btn btn-default" data-toggle="modal" data-target="#tableconfig" title="Configure table"><i class="fa fa-cog"></i> Configure</button>
     {% endif %}
     {% if permissions.add and 'add' in action_buttons %}