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

lib/ansible/modules/extras/windows/win_iis_website.ps1

@@ -171,7 +171,13 @@ Catch
   Fail-Json (New-Object psobject) $_.Exception.Message
 }
 
+if ($state -ne 'absent')
+{
   $site = Get-Website | Where { $_.Name -eq $name }
+}
+
+if ($site)
+{
   $result.site = New-Object psobject @{
     Name = $site.Name
     ID = $site.ID
@@ -180,6 +186,6 @@ $result.site = New-Object psobject @{
     ApplicationPool = $site.applicationPool
     Bindings = @($site.Bindings.Collection | ForEach-Object { $_.BindingInformation })
   }
-
+}
 
 Exit-Json $result