missing globals

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@999 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/XMLExportImport.py

@@ -31,7 +31,7 @@ from Acquisition import aq_base, aq_inner
 from cStringIO import StringIO
 from email.MIMEBase import MIMEBase
 from email import Encoders
-from pickle import Pickler
+from pickle import Pickler, EMPTY_DICT, MARK, DICT
 from xml.sax.saxutils import escape, unescape
 
 from zLOG import LOG