SharePoint - Unpublish a published content type if the published content type no longer exists

unpublischoct.ps1

Add-PSSnapIn Microsoft.SharePoint.PowerShell 

if ($args.Count -ne 3) 
{ 
   Write-Host "UnpublishContentTypes.ps1 <web url> <content type hub url> <unpublish>" 
   exit 
} 

$webUrl = $args[0] 
$ctUrl = $args[1] 
$unpublish = $args[2] 


$web = Get-SPWeb $webUrl 
$ctsite = Get-SPSite $ctUrl 
$ctPublisher = New-Object Microsoft.SharePoint.Taxonomy.ContentTypeSync.ContentTypePublisher($ctsite) 

foreach($ct in $web.ContentTypes) 
{ 
    if ( $ct.XmlDocuments -like "*SharedContentType*") 
    { 
        try 
        {  
            if (-not $ctsite.RootWeb.ContentTypes[$ct.Name]) 
            { 
                Write-Host "Found orphan Shared ContentType $($ct.Name) - ($($ct.ID))" 
              
                if($unpublish) 
                { 
                    $ctPublisher.UnPublish($ct) 
                    Write-Host "$($ct.Name) - ($($ct.ID)) UnPublished successfully" 
                } 
            } 
        } 
        catch 
        { 
            Write-Host "Error unpublishing ContentType $($ct.Name) - ($($ct.ID)): $error[0]" 
        } 
    } 
} 

if($unpublish) 
{ 
    Start-SPTimerJob MetadataSubscriberTimerJob 
}