Error in horizon on the user page after press to Filter butto

[Sergey Galkin]

api: '1.0'
astute_sha: 6a11a7c481d116e6cfdb422fab1d4bbb29cbea1c
auth_required: true
build_id: 2014-10-21_22-46-19
build_number: '156'
feature_groups:
- mirantis
fuellib_sha: af2bf11d4a3a075fa4e9fa9b7b7209af29498a46
fuelmain_sha: dab17913263bbea7e9a3b55de8a0f3af5ac0e3e2
nailgun_sha: f4bf25da24c4e5b0d9eb86493945200deba3d92e
ostf_sha: de177931b53fbe9655502b73d03910b8118e25f1
production: docker
release: '6.0'

Steps to reproduce:
1. Deploy cluster
2. Login to dashboard
3. Open Users page (horizon/identity/users/)
5. Input '123' in filter, press Filter button.

Something went wrong! message is appear

In logs:
<139>Oct 22 10:18:55 node-29 dashboard-horizon.tables.base: ERROR Error while rendering table rows.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/horizon/tables/base.py", line 1730, in get_rows
    for datum in self.filtered_data:
  File "/usr/lib/python2.7/dist-packages/horizon/tables/base.py", line 1193, in filtered_data
    filter_string)
  File "/usr/share/openstack-dashboard/openstack_dashboard/wsgi/../../openstack_dashboard/dashboards/identity/users/tables.py", line 159, in filter
    or q in getattr(user, 'email', '').lower()]
AttributeError: 'NoneType' object has no attribute 'lower'

[Timur Sufiev (tsufiev-x)]

Upstream bug: https://bugs.launchpad.net/horizon/+bug/1383630