Heat loadbalancer resource failing to create

Issue

When trying to create a loadbalancer resource using heat the following error is found in /var/log/heat/heat-engine.log

2014-06-28 21:03:02.356 31531 INFO heat.engine.resource [-] creating LoadBalancer "dynsrv-facade-lb"
2014-06-28 21:03:02.434 31531 ERROR heat.engine.resource [-] CREATE : LoadBalancer "dynsrv-facade-lb"
2014-06-28 21:03:02.434 31531 TRACE heat.engine.resource Traceback (most recent call last):
2014-06-28 21:03:02.434 31531 TRACE heat.engine.resource   File "/usr/lib/python2.6/site-packages/heat/engine/resource.py", line 368, in _do_action
2014-06-28 21:03:02.434 31531 TRACE heat.engine.resource     handle_data = handle()
2014-06-28 21:03:02.434 31531 TRACE heat.engine.resource   File "/usr/lib/python2.6/site-packages/heat/engine/resources/neutron/loadbalancer.py", line 328, in handle_create
2014-06-28 21:03:02.434 31531 TRACE heat.engine.resource     for member in self.properties.get('members', []):
2014-06-28 21:03:02.434 31531 TRACE heat.engine.resource TypeError: 'NoneType' object is not iterable
2014-06-28 21:03:02.434 31531 TRACE heat.engine.resource
2014-06-28 21:03:02.617 31531 WARNING heat.engine.service [-] Stack create failed, status FAILED