update fails with updating an item, that contains only key attrs

[Andrii Ostapenko]

While updating an item, that contains only key attributes we get 500 error

Server side:

  File "/usr/local/lib/python2.7/dist-packages/webob/request.py", line 1284, in call_application
    app_iter = application(self.environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
    return resp(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/routes/middleware.py", line 131, in __call__
    response = self.app(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
    return resp(environ, start_response)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
    resp = self.call_func(req, *args, **self.kwargs)
  File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
    return self.func(req, *args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/common/wsgi.py", line 244, in __call__
    action_result = self.execute_action(action, request, **action_args)
  File "/opt/stack/magnetodb/magnetodb/common/wsgi.py", line 258, in execute_action
    return self.dispatch(self.controller, action, request, **action_args)
  File "/opt/stack/magnetodb/magnetodb/common/wsgi.py", line 267, in dispatch
    return method(*args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/api/__init__.py", line 35, in wrapper
    return f(self, *args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/common/probe.py", line 94, in wrapper
    return f(*args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/api/openstack/v1/data/update_item.py", line 84, in process_request
    expected_condition_map=expected_item_conditions)
  File "/opt/stack/magnetodb/magnetodb/storage/__init__.py", line 309, in update_item
    expected_condition_map
  File "/opt/stack/magnetodb/magnetodb/storage/manager/simple_impl.py", line 668, in update_item
    expected_condition_map
  File "/opt/stack/magnetodb/magnetodb/common/probe.py", line 94, in wrapper
    return f(*args, **kwargs)
  File "/opt/stack/magnetodb/magnetodb/storage/driver/cassandra/cassandra_with_custom_lsi_impl.py", line 918, in update_item
    if result[0]['[applied]']:
TypeError: 'NoneType' object has no attribute '__getitem__'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/151394

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/151394
Committed: https://git.openstack.org/cgit/stackforge/magnetodb/commit/?id=df39ad7eb000b24a6d93bbe902552a168fe72ae8
Submitter: Jenkins
Branch: master

commit df39ad7eb000b24a6d93bbe902552a168fe72ae8
Author: Andrei V. Ostapenko <email address hidden>
Date: Thu Jan 29 23:47:15 2015 +0200

    Fix bug with update item that contains only key attributes

    Closes-bug: #1416112
    Change-Id: Ice5a765b7cfe34942c5b74c0d4f98d414c5c9678