Support case of non instantiated instances.

Code shall return empty list of packing lists if instance is not instantiated
yet.

master/bt5/vifib_slap/WorkflowTemplateItem/portal_workflow/slap_interaction_workflow/scripts/ERP5Site_getSlaveInstanceListFromComputerPartition.xml

@@ -60,6 +60,8 @@ sale_packing_list_line = portal.portal_catalog.getResultValue(\n
   portal_type="Sale Packing List Line",\n
   aggregate_relative_url=relative_url)\n
 \n
+if sale_packing_list_line is None:\n
+  return []\n
 computer_partition_relative_url = sale_packing_list_line.getAggregate(\n
   portal_type="Computer Partition")\n
 \n

master/bt5/vifib_slap/bt/revision

-439
\ No newline at end of file
+440
\ No newline at end of file