How to modify csv headers with powershell when there are no rows? - powershell

Question

I have a PowerShell script that reads the CSV file, combines two rows into one based on condition, modifies column names, and exports a new CSV file. The problem is that script isn't working when CSV file has no rows although column names still need to be modified. I don't really know Powershell so any help will be greatly appreciated.
$csv = import-csv "<CSVFilePath>"
$fars = #()
$nears = #()
$combined = #()
foreach($line in $csv){
if(<CONDITION>) {
$fars += $line
} else {
$nears += $line
}
}
foreach($far in $fars){
foreach($near in $nears) {
if(<CONDITION>) {
$o = New-Object -Type PSObject
$far.PSObject.Properties | ForEach-Object {
$far_field = $_.Name + " FAR"
$o | Add-Member -Name $far_field -Type NoteProperty -Value $_.Value
}
$near.PSObject.Properties| ForEach-Object {ls
$near_field = $_.Name + " NEAR"
$o | Add-Member -Name $near_field -Type NoteProperty -Value $_.Value
}
$combined += $o
}
}
}
$combined | ConvertTo-Csv -NoTypeInformation | ForEach-Object { $_ -replace '"', ""} | out-file "<CSVFilePath>" -fo -en ascii