forgot to import function

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk/utils@40592 20353a03-c40f-0410-a6d1-a30d3c3de9de

cloudooo/manager.py

@@ -27,7 +27,7 @@
 #
 ##############################################################################
 
-from mimetypes import guess_all_extensions
+from mimetypes import guess_all_extensions, guess_extension
 from base64 import encodestring, decodestring
 from zope.interface import implements
 from interfaces.manager import IManager, IERP5Compatibility