Add guard for FilterModifierWidget with no lookups

netbox/utilities/templates/widgets/filter_modifier.html

@@ -1,4 +1,5 @@
 <div class="d-flex filter-modifier-group">
+  {% if widget.lookups %}
     {# Modifier dropdown - NO name attribute, just a UI control #}
     <select class="form-select modifier-select"
             data-field="{{ widget.field_name }}"
@@ -8,6 +9,7 @@
         <option value="{{ lookup }}"{% if widget.current_modifier == lookup %} selected{% endif %}>{{ label }}</option>
       {% endfor %}
     </select>
+  {% endif %}
 
   {# Original widget - rendered exactly as it would be without our wrapper #}
   <div class="ms-2 flex-grow-1 filter-value-container">