Fixed nil fields being dereferenced for public ips #515
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When iterating through some VMs, the PublicIPAddress field on the ipConfig struct can be nil. In these cases, we don't want to dereference and just want to go to the next configuration.
Also, the IPAddress for a nic IP could also be nil and in the same case, we do not want to dereference and add to the list. We'd rather leave it off.