remove useless imports

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27016 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/EmailDocument.py

@@ -51,12 +51,6 @@ except ImportError:
     A dummy exception class which is used when MimetypesRegistry product is
     not installed yet.
     """
-try:
-  import libxml2
-  import libxslt
-  import_libxml2 = 1
-except ImportError:
-  import_libxml2 = 0
 
 from email import message_from_string
 from email.Header import decode_header, HeaderParseError