Missing registry keys should not exist

lib/resources/registry_key.rb

@@ -147,6 +147,11 @@ module Inspec::Resources
       script = <<-EOH
       Function InSpec-GetRegistryKey($path) {
         $reg = Get-Item ('Registry::' + $path)
+        if ($reg -eq $null) {
+          Write-Error "InSpec: Failed to find registry key"
+          exit 1001
+        }
+
         $properties = New-Object -Type PSObject
         $reg.Property | ForEach-Object {
             $key = $_
@@ -167,11 +172,16 @@ module Inspec::Resources
       # cannot rely on exit code for now, successful command returns exit code 1
       # return nil if cmd.exit_status != 0, try to parse json
       begin
-        @registry_cache = JSON.parse(cmd.stdout)
-        # convert keys to lower case
-        @registry_cache = Hash[@registry_cache.map do |key, value|
-          [key.downcase, value]
-        end]
+        if cmd.exit_status == 1001 && cmd.stderr =~ /InSpec: Failed to find registry key/
+          # TODO: provide the stderr output
+          @registry_cache = nil
+        else
+          @registry_cache = JSON.parse(cmd.stdout)
+          # convert keys to lower case
+          @registry_cache = Hash[@registry_cache.map do |key, value|
+            [key.downcase, value]
+          end]
+        end
       rescue JSON::ParserError => _e
         @registry_cache = nil
       end

test/helper.rb

@@ -147,7 +147,7 @@ class MockLoader
       '${Env:PATH}'  => cmd.call('$env-PATH'),
       # registry key test using winrm 2.0
       '2376c7b3d81de9382303356e1efdea99385effb84788562c3e697032d51bf942' => cmd.call('reg_schedule'),
-      'F2376c7b3d81de9382303356e1efdea99385effb84788562c3e697032d51bf942' => cmd.call('reg_schedule'),
+      '89b48f91634e7efc40105fc082c5e12693b08c0a7c4a578b1f3a07e34f676c66' => cmd.call('reg_schedule'),
       'Auditpol /get /subcategory:\'User Account Management\' /r' => cmd.call('auditpol'),
       '/sbin/auditctl -l' => cmd.call('auditctl'),
       '/sbin/auditctl -s' => cmd.call('auditctl-s'),

test/integration/default/registry_key_spec.rb

@@ -21,6 +21,10 @@ describe registry_key('HKLM\System\Test') do
   it { should have_property_value('Binary value', :binary, 'dfa0f066') }
 end
 
+describe registry_key('HKLM\Missing\In\Action') do
+  it { should_not exist }
+end
+
 # serverspec compatability
 describe windows_registry_key('HKLM\System\Test') do
   it { should exist }