metadata_value_by_key on google_compute_instance returns error

[mattbowes]

Using profile 1.4.0 and calling metadata_value_by_key on google_compute_instance the following error is returned

undefined method `item' for #<Hash:0x00007f05967f0e70>

Describe the problem

describe google_compute_instance(project: gcp_project_id, zone: gce_zones, name: vm).metadata_value_by_key('serial-port-enable') do
    it { should be false }
  end

returns

undefined method `item' for #<Hash:0x00007f05967f0e70>

Possible Solution

[slevenick]

Fixed via #259