> @@ -155,6 +178,8 @@ protected ToStringHelper string() {
>           toString.add("networks", networks);
>        toString.add("availability_zone", availabilityZone == null ? null : 
> availabilityZone);
>        toString.add("configDrive", configDrive);
> +      if (!blockDeviceMapping.isEmpty())

Much as I prefer `!isEmpty` over `size() > 0`, the latter is used everywhere 
else in this method, so switch to that?

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