don't remove empty trash bins at end of install

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4651 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessTemplate.py

@@ -2841,10 +2841,6 @@ Business Template is a set of definitions, such as skins, portal types and categ
           item = getattr(self, item_name)
           if item is not None:
             item.install(local_configuration, force=force, object_to_update=object_to_update, trashbin=trashbin)
-       # if trahs bin is empty, remove it
-      if trashbin is not None:
-        if len(trashbin.objectIds()) == 0:
-          self.portal_trash.manage_delObjects(trashbin.getId())
       # It is better to clear cache because the installation of a template
       # adds many new things into the portal.
       clearCache()