Exception Handeling for Powershell

$date = ( get-date ).ToString('yyyyMMdd')
"Computer info on $date" > "Q:\logs\$date-comp-info.txt"
$computers = Get-Content Q:\logs\computers.txt
$pass = cat C:\securestring.txt | convert-tosecurestring                                                                                 
$mycred = new-object -typename System.Management.Automation.PSCredential -argumentlist DOMAIN\admin,$pass
 
foreach($computer in $computers){
  if($computer){
    echo "Scanning $computer"
    $info = gwmi win32_computersystem -Computername $computer -Credential $mycred
    $info | Add-Content -Path "Q:\logs\$date-comp-info.txt" -Encoding Unicode
  }
}