Remove whitespaces and useless imports.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44371 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Workflow/Document/Workflow.py

@@ -30,12 +30,9 @@ from AccessControl import ClassSecurityInfo
 
 from Products.ERP5Type import Permissions, PropertySheet
 from Products.ERP5Type.XMLObject import XMLObject
-from zLOG import LOG, ERROR, DEBUG, WARNING
 
 from tempfile import mktemp
 import os
-import sys
-from os.path import basename, splitext, join
 from Products.DCWorkflowGraph.config import bin_search_path, DOT_EXE
 from Products.DCWorkflowGraph.DCWorkflowGraph import bin_search