Launch configuration EBS block devices missing property values

[paulyhedral]

When running against launch configurations, some resource definitions contain an ebs_block_device block that is missing some values, like this:

   ebs_block_device {
        device_name           = "/dev/xvdcz"
        volume_type           = "gp2"
        volume_size           = 
        delete_on_termination = 
    }