Error in display if a volume is created with nova command

How to create the bug:
1. Start with ./stack.sh in devstack.
2. Create a volume with command:
nova volume-create --display_name test 1
3. Visit the link in the browser: http://<IP>/nova/instances_and_volumes/

Expected result:
The webpage should be displayed with the created volume.

Actual Result:
TypeError at /nova/instances_and_volumes/

object of type 'NoneType' has no len()

Request Method: GET
Request URL: http://9.119.148.27/nova/instances_and_volumes/
Django Version: 1.4
Exception Type: TypeError
Exception Value:

object of type 'NoneType' has no len()

Exception Location: /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/dashboards/nova/instances_and_volumes/views.py in get_volumes_data, line 75
Python Executable: /usr/bin/python
Python Version: 2.7.3
Python Path:

['/opt/stack/horizon/openstack_dashboard/wsgi/../..',
 '/opt/stack/python-keystoneclient',
 '/opt/stack/python-novaclient',
 '/opt/stack/python-openstackclient',
 '/usr/local/lib/python2.7/dist-packages/cliff-0.7-py2.7.egg',
 '/usr/local/lib/python2.7/dist-packages/tablib-0.9.11-py2.7.egg',
 '/opt/stack/keystone',
 '/usr/local/lib/python2.7/dist-packages/WebOb-1.0.8-py2.7.egg',
 '/usr/local/lib/python2.7/dist-packages/pam-0.1.4-py2.7.egg',
 '/opt/stack/glance',
 '/usr/local/lib/python2.7/dist-packages/jsonschema-0.2-py2.7.egg',
 '/usr/local/lib/python2.7/dist-packages/pysendfile-2.0.0-py2.7-linux-x86_64.egg',
 '/usr/local/lib/python2.7/dist-packages/boto-2.1.1-py2.7.egg',
 '/opt/stack/nova',
 '/opt/stack/horizon',
 '/opt/stack/python-quantumclient',
 '/opt/stack/quantum',
 '/usr/local/lib/python2.7/dist-packages/python_gflags-1.3-py2.7.egg',
 '/opt/stack/swift',
 '/opt/stack/swift3',
 '/usr/local/lib/python2.7/dist-packages/django_compressor-1.1.2-py2.7.egg',
 '/usr/local/lib/python2.7/dist-packages/django_appconf-0.5-py2.7.egg',
 '/opt/stack/python-swiftclient',
 '/usr/local/lib/python2.7/dist-packages',
 '/opt/stack/python-glanceclient',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-linux2',
 '/usr/lib/python2.7/lib-tk',
 '/usr/lib/python2.7/lib-old',
 '/usr/lib/python2.7/lib-dynload',
 '/usr/local/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages/PIL',
 '/usr/lib/python2.7/dist-packages/gst-0.10',
 '/usr/lib/python2.7/dist-packages/gtk-2.0',
 '/usr/lib/pymodules/python2.7',
 '/usr/lib/python2.7/dist-packages/ubuntu-sso-client',
 '/usr/lib/python2.7/dist-packages/ubuntuone-client',
 '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel',
 '/usr/lib/python2.7/dist-packages/ubuntuone-couch',
 '/usr/lib/python2.7/dist-packages/ubuntuone-installer',
 '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol',
 '/opt/stack/horizon/openstack_dashboard']

Traceback Switch to copy-and-paste view

    /usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py in get_response

                                response = callback(request, *callback_args, **callback_kwargs)

        ...
    ▶ Local vars
    /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/decorators.py in dec

                return view_func(request, *args, **kwargs)

        ...
    ▶ Local vars
    /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/decorators.py in dec

                    return view_func(request, *args, **kwargs)

        ...
    ▶ Local vars
    /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/decorators.py in dec

                return view_func(request, *args, **kwargs)

        ...
    ▶ Local vars
    /usr/local/lib/python2.7/dist-packages/django/views/generic/base.py in view

                    return self.dispatch(request, *args, **kwargs)

        ...
    ▶ Local vars
    /usr/local/lib/python2.7/dist-packages/django/views/generic/base.py in dispatch

                return handler(request, *args, **kwargs)

        ...
    ▶ Local vars
    /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/tables/views.py in get

                handled = self.construct_tables()

        ...
    ▶ Local vars
    /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/tables/views.py in construct_tables

                    handled = self.handle_table(table)

        ...
    ▶ Local vars
    /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/tables/views.py in handle_table

                data = self._get_data_dict()

        ...
    ▶ Local vars
    /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/tables/views.py in _get_data_dict

                        self._data[table._meta.name] = data_func()

        ...
    ▶ Local vars
    /opt/stack/horizon/openstack_dashboard/wsgi/../../horizon/dashboards/nova/instances_and_volumes/views.py in get_volumes_data

                        if len(getattr(volume, 'display_description', '')) > 33:

        ...
    ▶ Local vars