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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

** Changed in: nova/rocky
   Importance: Undecided => Medium

** Changed in: nova/rocky
       Status: New => Triaged

** Tags added: cells

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https://bugs.launchpad.net/bugs/1798158

Title:
  Non-templated transport_url will fail if not defined in config

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) rocky series:
  Triaged

Bug description:
  If transport_url is not defined in the config, we will fail to format
  a non-templated transport_url in the database like this:

  ERROR nova.objects.cell_mapping [None req-34831485-adf4-4a0d-bb20-e1736d93a451 None None] Failed to parse [DEFAULT]/transport_url to format cell mapping: AttributeError: 'NoneType' object has no attribute 'find'
  ERROR nova.objects.cell_mapping Traceback (most recent call last):
  ERROR nova.objects.cell_mapping   File "/opt/stack/nova/nova/objects/cell_mapping.py", line 150, in _format_mq_url
  ERROR nova.objects.cell_mapping     return CellMapping._format_url(url, CONF.transport_url)
  ERROR nova.objects.cell_mapping   File "/opt/stack/nova/nova/objects/cell_mapping.py", line 101, in _format_url
  ERROR nova.objects.cell_mapping     default_url = urlparse.urlparse(default)
  ERROR nova.objects.cell_mapping   File "/usr/lib/python2.7/urlparse.py", line 143, in urlparse
  ERROR nova.objects.cell_mapping     tuple = urlsplit(url, scheme, allow_fragments)
  ERROR nova.objects.cell_mapping   File "/usr/lib/python2.7/urlparse.py", line 182, in urlsplit
  ERROR nova.objects.cell_mapping     i = url.find(':')
  ERROR nova.objects.cell_mapping AttributeError: 'NoneType' object has no attribute 'find'
  ERROR nova.objects.cell_mapping

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