Revising Powershell Script that check Print Queue

A number of months ago ,  EE expert " Joshua Grantom "wrote the script below that checked a printer UNC path and sent the results to CSV listing if it was up or down. I have noticed when the script hist a queue it cannot connect to it stops the script from continuing any suggestions on how to correct this

# Script Author: Joshua Grantom 
# Version: 1.1
# Purpose: Checks a list of Printers by UNC path to see if they are connectable

#Loads Windows Forms Assembly
[Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
#Printer List (1 UNC Printer path per line)
$printers = Get-Content "c:\PrintQueues.txt"
#CSV File to Output to
$outputfile = "c:\PrintQueues.csv"
#Adds Header to CSV File
"Printer UNC Path `t Connection Status" | Out-File $outputfile -append
#Tries to connect to each printers queue (does not require drivers to be installed)
foreach ($printer in $printers) {
Invoke-Expression -command "rundll32 printui,PrintUIEntry /o /n '$printer'"
#Sleep time in seconds until script resumes (can increase if it takes longer to query printer)
Start-Sleep -s 2
$window = Get-Process rundll32 | Where-Object {$_.MainWindowTitle -like "*"} | Select MainWindowTitle | ft -HideTableHeaders | Out-String
IF([string]::IsNullOrWhiteSpace($window)){
    #If rundll32 window title is blank, usually means error, write error
    "$printer`t Error Connecting" | Out-File $outputfile -append
}else{
    #If rundll32 window title is not blank, usually means queue is opened, write success
    "$printer`t Successfully Connected" | Out-File $outputfile -append
}
# Closes active window (print queue or error message)
[System.Windows.Forms.SendKeys]::SendWait("%{F4}") 
}
                                          

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