ERP5PersistentMappingFolder: objectValues must return objects with acquisition wrappers.

Also remove assertion on "spec is None", otherwise we have failure (it is used
by portal_caches somewhere).

product/ERP5Type/Core/ERP5PersistentMappingFolder.py

@@ -96,7 +96,7 @@ class ERP5PersistentMappingFolder(PortalFolderBase):
                    sort_order=None, checked_permission=None, **kw):
     # Returns list of objects contained in this folder.
     #  (no docstring to prevent publishing)
-    assert(spec is None)
+    #assert(spec is None)
 
     if self._object_dict is None:
       return []
@@ -111,7 +111,7 @@ class ERP5PersistentMappingFolder(PortalFolderBase):
       checkPermission = getSecurityManager().checkPermission
       object_list = [o for o in object_list
                        if checkPermission(checked_permission, o)]
-    return sortValueList(object_list, sort_on, sort_order, **kw)
+    return [x.__of__(self) for x in sortValueList(object_list, sort_on, sort_order, **kw)]
 
   security.declareProtected(Permissions.AccessContentsInformation,
                             'keys', 'items', 'values')