[enhancement] use thumbnails in grid views, patch to make thumbnails
diff --git a/erpnext/templates/generators/item.html b/erpnext/templates/generators/item.html
index 30ccbce..f24b1a6 100644
--- a/erpnext/templates/generators/item.html
+++ b/erpnext/templates/generators/item.html
@@ -94,6 +94,8 @@
 
     {% if variant_info %}
     window.variant_info = {{ variant_info }};
+    {% else %}
+    window.variant_info = null;
     {% endif %}
 </script>
 {% endblock %}