[Bug 1418187] Re: _get_host_numa_topology assumes numa cell has memory

[Daniel Berrange]

FYI, having _get_host_numa_topology() not generate an exception on
reporting is the least of our worries here. The scheduling placement
code for NUMA guests assumes that all NUMA cells have both memory &
cpus. So with the proposed patch you will have silenced the exception,
but Nova will still be broken in practice, because it'll never schedule
guests on 1/2 of the CPUs in this host - ie the ones without local
memory will never get used. Fixing this is a far more invasive problem.

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Title:
  _get_host_numa_topology assumes numa cell has memory

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