UnicodeDecodeError in plone.app.users caused by Umlauts in AD Group IDs

[pabo3000]

Unfortunately Microsaft's AD allows Group Ids with Umlauts. plone.app.ldap has no strategy to deal with umlauts in group ids.

(Pdb) 2012-04-03 15:42:46 ERROR Zope.SiteErrorLog 1333460566.540.0499230695886 http://139.11.81.52:8080/plone/@@new-user
Traceback (innermost last):
Module ZPublisher.Publish, line 126, in publish
Module ZPublisher.mapply, line 77, in mapply
Module Products.PDBDebugMode.runcall, line 70, in pdb_runcall
Module ZPublisher.Publish, line 46, in call_object
Module zope.formlib.form, line 795, in call
Module five.formlib.formbase, line 50, in update
Module zope.formlib.form, line 758, in update
Module zope.formlib.form, line 739, in setUpWidgets
Module zope.formlib.form, line 266, in setUpWidgets
Module zope.schema._field, line 408, in bind
Module zope.schema._field, line 291, in bind
Module Zope2.App.schema, line 33, in get
Module plone.app.users.browser.register, line 173, in getGroupIds
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe4 in position 1: ordinal not in range(128)

[jmce]

Also here https://bugs.launchpad.net/ldapuserfolder/+bug/898921 — I did as suggested, changing encoding to 'utf-8' in utils.py. But it seems it is considered a low importance issue there (why?)