[resource] iis_app_pool fails with error when pool is absent (🐛)

[TheLonelyGhost]

🎛 Description

🐛 Bug Report

When running a basic InSpec profile to check if an IIS app pool is absent, PowerShell fails out instead of passing back something that can be parsed as JSON.

🌍 InSpec and Platform Version

2.1.54 via ChefDK (MacOS 10.13.6)

🤔 Replication Case

# Any non-existent app pool name will suffice:
describe iis_app_pool('FizzBuzz') do
  it { should_not exist }
end

💁 Possible Solutions

Add a Test-Path line before running Get-Item in PowerShell to keep all output to STDOUT just stuff the ruby JSON parser can handle.

💻 Stacktrace

N/a