Traceback on Nodes page

When there are any Nodes registered at Infrastructure/Nodes page, page cannot be displayed.

Steps to reproduce:
1. Go to Infrastructure/Nodes page
2. Add some new Nodes
3. Again go to Infrastructure/Nodes page (should be autoreloaded)

Diagnose:
Nodes are missing info about CPUs, memory, etc.

> /root/tuskar-ui/tuskar_ui/infrastructure/nodes/tabs.py(43)get_context_data()
-> cpus = sum(int(node.cpus) for node in nodes if node.cpus)
(Pdb) nodes
[<Node: {'instance_uuid': None, 'provision_state': u'available', 'maintenance': False, 'uuid': u'38621595-d0a0-4497-b4bd-25f9fa7d9a31', 'power_state': u'power off'}>]

Traceback

Environment:

Request Method: GET
Request URL: http://10.237.154.48/infrastructure/nodes/

Django Version: 1.7
Python Version: 2.7.6
Installed Applications:
['openstack_dashboard.dashboards.project',
 'openstack_dashboard.dashboards.admin',
 'openstack_dashboard.dashboards.identity',
 'openstack_dashboard.dashboards.settings',
 'tuskar_ui.infrastructure',
 'openstack_dashboard',
 'django.contrib.contenttypes',
 'django.contrib.auth',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.humanize',
 'django_pyscss',
 'openstack_dashboard.django_pyscss_fix',
 'compressor',
 'horizon',
 'openstack_auth']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.doc.XViewMiddleware',
 'horizon.middleware.HorizonMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  111. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/root/horizon/horizon/decorators.py" in dec
  36. return view_func(request, *args, **kwargs)
File "/root/horizon/horizon/decorators.py" in dec
  84. return view_func(request, *args, **kwargs)
File "/root/horizon/horizon/decorators.py" in dec
  52. return view_func(request, *args, **kwargs)
File "/root/horizon/horizon/decorators.py" in dec
  36. return view_func(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/generic/base.py" in view
  69. return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/views/generic/base.py" in dispatch
  87. return handler(request, *args, **kwargs)
File "/root/horizon/horizon/tabs/views.py" in get
  146. context = self.get_context_data(**kwargs)
File "/root/tuskar-ui/tuskar_ui/infrastructure/nodes/views.py" in get_context_data
  72. context = super(IndexView, self).get_context_data(**kwargs)
File "/root/tuskar-ui/tuskar_ui/infrastructure/views.py" in get_context_data
  25. context = super(ItemCountMixin, self).get_context_data(**kwargs)
File "/root/horizon/horizon/tables/views.py" in get_context_data
  107. context = super(MultiTableMixin, self).get_context_data(**kwargs)
File "/root/horizon/horizon/tabs/views.py" in get_context_data
  56. exceptions.handle(self.request)
File "/root/horizon/horizon/exceptions.py" in handle
  364. six.reraise(exc_type, exc_value, exc_traceback)
File "/root/horizon/horizon/tabs/views.py" in get_context_data
  54. context["tab_group"].load_tab_data()
File "/root/horizon/horizon/tabs/base.py" in load_tab_data
  128. exceptions.handle(self.request)
File "/root/horizon/horizon/exceptions.py" in handle
  364. six.reraise(exc_type, exc_value, exc_traceback)
File "/root/horizon/horizon/tabs/base.py" in load_tab_data
  125. tab._data = tab.get_context_data(self.request)
File "/root/tuskar-ui/tuskar_ui/infrastructure/nodes/tabs.py" in get_context_data
  42. cpus = sum(int(node.cpus) for node in nodes if node.cpus)
File "/root/tuskar-ui/tuskar_ui/infrastructure/nodes/tabs.py" in <genexpr>
  42. cpus = sum(int(node.cpus) for node in nodes if node.cpus)
File "/root/horizon/openstack_dashboard/api/base.py" in __getattribute__
  107. return object.__getattribute__(self, attr)
File "/root/tuskar-ui/tuskar_ui/cached_property.py" in __get__
  62. res = instance.__dict__[self.func.__name__] = self.func(instance)
File "/root/tuskar-ui/tuskar_ui/api/node.py" in cpus
  329. return self.properties.get('cpus', None)
File "/root/horizon/openstack_dashboard/api/base.py" in __getattribute__
  112. return getattr(self._apiresource, attr)
File "/usr/local/lib/python2.7/dist-packages/ironicclient/openstack/common/apiclient/base.py" in __getattr__
  480. raise AttributeError(k)

Exception Type: AttributeError at /infrastructure/nodes/
Exception Value: properties