erp5_full_text_mroonga_catalog: Consider Unauthorized indexations as successful.

This was the case before
  commit b41dc8e0
  Author: Vincent Pelletier <vincent@nexedi.com>
  Date:   Wed Sep 12 04:00:08 2018 +0200

      SQLCatalog_deferFullTextIndex{,Activity}: Use serialization_tag .
but I misread the code: when this exception triggered, document was neither
added in parameter_dict nor in failed_path_list. It should be now clearer.

bt5/erp5_full_text_mroonga_catalog/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/SQLCatalog_deferFullTextIndexActivity.py

@@ -19,7 +19,8 @@ for group_object in object_list:
   except ConflictError:
     raise
   except Unauthorized: # should happen in tricky testERP5Catalog tests only
-    continue
+    # Fake activity success: if indexation cannot View document, ignore it.
+    group_object.result = None
   except Exception, e:
     group_object.raised()
   else: