Hammer CLI

When not specifying the 'path' under --compute-attributes section when trying to create a host in vmware and provision it by image,
then you will get the following error:

Could not create the host:
Failed to create a compute vmware (VMware) instance test.tlv.redhat.com: undefined method `sub' for nil:NilClass

The command line to reproduce:
hammer host create --name test --environment-id 1 --organization-id 2 --location-id 1 --hostgroup-id 1 --operatingsystem-id 1 --architecture "x86_64" --domain-id 1 --subnet-id 1 --compute-resource-id 14 --provision-method 'image' --compute-attributes "cpus=1, corespersocket=2, memory_mb=4096, cluster=Compute_Cluster, image_id=XXXXX" --interface "compute_network=XXXX, type=interface , managed=1, primary=1, provision=1, type=interface" --ip XXX.XXX.XXX.XXX --volume "datastore=XXXX, size_gb=1, thin=true"