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[Alan Pevec <1392316@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1392316

Title:
  Hypervisors returns TemplateSyntaxError instead of error message

Status in OpenStack Dashboard (Horizon):
  Fix Released
Status in OpenStack Dashboard (Horizon) juno series:
  Fix Released

Bug description:
  When trying to list hypervisor at /admin/hypervisors/
  I got TemplateSyntaxError. It happens when novaclient (nova-api) 
  cannot fulfil the request.

  The exception in Horizon:

  Error while rendering table rows.
  Traceback (most recent call last):
    File "/opt/stack/horizon/horizon/tables/base.py", line 1751, in get_rows
      for datum in self.filtered_data:
  TypeError: 'NoneType' object is not iterable
  Internal Server Error: /admin/hypervisors/
  Traceback (most recent call last):
    ...
    File "/opt/stack/horizon/horizon/tables/base.py", line 1751, in get_rows
      for datum in self.filtered_data:
  TemplateSyntaxError: 'NoneType' object is not iterable

  
  IMO it should be more robust and just return error message. It would be more 
  consistent with how other views handles unavailable services.

  To reproduce the error it is enough that novaclient raise exception. Example for this 
  is my case was when zookeeper as servicegroup driver is used, but 
  nova-conductor hasn't yet prepared the required namespace (because of bug [1]) - which 
  ends that nova-api had internal error:

  nova.api.openstack ServiceGroupUnavailable: The service from servicegroup driver 
  ZooKeeperDriver is temporarily unavailable.

  This overall result is that whole hypervisor list page was
  unaccessible only because is was not possible to list nova services.

  [1] https://bugs.launchpad.net/nova/+bug/1389782

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