Fix #1099: Only populate site result when it is there

windows/win_iis_website.ps1

@@ -171,15 +171,21 @@ Catch
   Fail-Json (New-Object psobject) $_.Exception.Message
 }
 
-$site = Get-Website | Where { $_.Name -eq $name }
-$result.site = New-Object psobject @{
+if ($state -ne 'absent')
+{
+  $site = Get-Website | Where { $_.Name -eq $name }
+}
+
+if ($site)
+{
+  $result.site = New-Object psobject @{
     Name = $site.Name
     ID = $site.ID
     State = $site.State
     PhysicalPath = $site.PhysicalPath
     ApplicationPool = $site.applicationPool
     Bindings = @($site.Bindings.Collection | ForEach-Object { $_.BindingInformation })
+  }
 }
 
-
 Exit-Json $result