erp5_wendelin_data_lake_ingestion: fix alarm control

bt5/erp5_wendelin_data_lake_ingestion/SkinTemplateItem/portal_skins/erp5_wendelin_data_lake/Alarm_checkDataStreamStateConsistency.py

@@ -8,5 +8,5 @@ for data_set in context.portal_catalog(portal_type = "Data Set",
                              aggregate_uid = data_set.getUid())
   for data_ingestion_line in data_ingestion_line_list:
     data_stream = data_ingestion_line.getAggregateValue(portal_type = "Data Stream")
-    if data_stream.getValidationState() == "validated":
+    if data_stream and data_stream.getValidationState() == "validated":
       data_stream.publish()