fixes puppet run failures with no IPAM driver

[davejrt]

fixes issue #108

[MWilsonPuppet]

LGTM

[tbrouhier]

fixes issue #108

Hi,

I don't think it does as the reported bug is about a call of empty? on nil and the last report I gave you was about the config

subnet = unless obj['IPAM']['Config'].empty?

"IPAM": {
            "Driver": "",
            "Options": null,
            "Config": null
        },

I guess that this commit is also at risk of having a null Driver instead of an empty object.

Possible solution ?
ipam_driver = unless obj['IPAM']['Driver'].nil? || obj['IPAM']['Driver'].empty?
and the same goes for the config
subnet = unless obj['IPAM']['Config'].nil? || obj['IPAM']['Config'].empty?

[davejrt]

You're correct, this was an error on my part, a new PR will be up shortly