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[Russell Bryant <1304600@xxxxxxxxxxxxxxxxxx>]

** Changed in: horizon
       Status: Fix Committed => Fix Released

** Changed in: horizon
    Milestone: None => juno-2

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https://bugs.launchpad.net/bugs/1304600

Title:
  network topology crashes with timing issue

Status in OpenStack Dashboard (Horizon):
  Fix Released

Bug description:
  Due to a timing issue, the network topology page can issue a 500 error
  if a subnet is deleted at the inopportune moment.

  Inside
  openstack_dashboard/dashboards/project/network_topology/views.py --->
  JSONView.get method

  neutron_networks = api.neutron.network_list_for_tenant(
                  request,
                  request.user.tenant_id)

  This can return a list of network objects whose subnet list can be
  [None]

  Later, we attempt to iterate over that list and pull the .cidr
  attribute off each element:

  ...
                      'subnets': [{'cidr': subnet.cidr}
                                  for subnet in network.subnets],
  ...

  Obviously, None doesn't have a .cidr attribute.

  
  The real cause is inside the api.neutron.network_list_for_tenant call above.  Each network's list of subnets should never include None.

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