Updated openstack/openstack
Project: openstack/ceilometer  a361009b224490a55e760dc4d4d5d0d6f1be5b4b
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Remove None for dict.get()

Because If no default value is specified it defaults to None already.

Change-Id: I2b2ad6d80b4f36bf01b8f4c6ecfb6bbd6d62e75b