Fixed a missing exception (`WindowsError`) when using the rmtree error handler...

from os.path import join, normcase, normpath, abspath, isabs, sep

from django.utils.encoding import force_unicode

try:

    WindowsError = WindowsError

except NameError:

    class WindowsError(Exception):

        pass

# Define our own abspath function that can handle joining

# unicode paths to a current working directory that has non-ASCII

# characters in it.  This isn't necessary on Windows since the

                         'path component (%s)' % (final_path, base_path))

    return final_path

def rmtree_errorhandler(func, path, exc_info):

    """

    On Windows, some files are read-only (e.g. in in .svn dirs), so when