Fix properly condition as we care if we find results and return explicitly if no results exists.

bt5/erp5_wendelin/SkinTemplateItem/portal_skins/erp5_wendelin/DataSet_getDataStreamList.py

@@ -6,7 +6,7 @@ catalog_kw = {'portal_type': 'Data Ingestion Line',
               'limit': limit,
               }
 data_ingestion_line_list = context.portal_catalog(**catalog_kw)
-if data_ingestion_line_list:
+if len(data_ingestion_line_list):
   data_ingestion_uid_list = [x.uid for x in data_ingestion_line_list]
   catalog_kw = {'portal_type': 'Data Stream',
                 'aggregate__related__uid': data_ingestion_uid_list,
@@ -14,4 +14,4 @@ if data_ingestion_line_list:
                 'select_list': ['reference', 'relative_url', 'versioning.size', 'versioning.version'],
                 }
   return context.getPortalObject().portal_catalog(**catalog_kw)
-return data_ingestion_line_list
+return []