Powershell Nested objects filtering empty values

The following workflow generates a list of all the printers on a server:

Workflow Get-PrintersInstalledHC {
    Param (
        [String[]]$Servers
    )
    Foreach -Parallel ($S in $Servers) {
        InlineScript {
            $S = $Using:S
            Write-Verbose "Server: $S"

            Try {
                if ($Printers = Get-Printer -ComputerName $S -Full -EA Stop) {
                    $Params = @{
                        ComputerName = $S
                        Property     = '*'
                        ErrorAction  = 'Stop'
                    } 
                    $Config = Get-CimInstance @Params -ClassName Win32_PrinterConfiguration
                    $Ports = Get-CimInstance @Params -ClassName Win32_TCPIPPrinterPort

                    Foreach ($P in $Printers) {
                        Write-Verbose "Printer: $($P.Name)"
                        Foreach($C in $Config) {
                            if ($P.Name -eq $C.Name) {
                                $PortHostAddress = $Ports | Where {$_.Name -eq $P.PortName} | 
                                                        Select -ExpandProperty HostAddress
                                $Prop = @{
                                    PortHostAddress     = $PortHostAddress
                                    DriverVersion       = $C.DriverVersion
                                    Collate             = $C.Collate
                                    Color               = $C.Color
                                    Copies              = $C.Copies
                                    Duplex              = $C.Duplex
                                    PaperSize           = $C.PaperSize
                                    Orientation         = $C.Orientation
                                    PrintQuality        = $C.PrintQuality
                                    MediaType           = $C.MediaType
                                    DitherType          = $C.DitherType
                                    RetrievalDate       = (Get-Date -Format 'dd/MM/yyyy HH:mm')
                                }
                                $P | Add-Member -NotePropertyMembers $Prop -TypeName NoteProperty
                                Break
                            }
                        }
                    }
                    [PSCustomObject]@{
                        ComputerName   = $S
                        ComputerStatus = 'Ok'
                        RetrievalDate  = (Get-Date -Format 'dd/MM/yyyy HH:mm')
                        Printers       = $Printers
                    }
                }
            }
            Catch {
                if (Test-Connection $S -Count 2 -EA Ignore) {
                    [PSCustomObject]@{
                        ComputerName   = $S
                        ComputerStatus = "ERROR: $($Error[0].Exception.Message)" 
                        RetrievalDate  = (Get-Date -Format 'dd/MM/yyyy HH:mm')
                        Printers       = $null
                    }
                }
                else {
                    [PSCustomObject]@{
                        ComputerName   = $S
                        ComputerStatus = 'Offline'
                        RetrievalDate  = (Get-Date -Format 'dd/MM/yyyy HH:mm')
                        Printers       = $null
                    }
                }
            }
        }
    }
}
$Printers = Get-PrintersInstalledHC Server1

What I am having trouble with is filtering out the empty values in $Printers.Printers.PortHostAddress. As discussed here it should suffice to just do:

$Printers.Printers.PortHostAddress | where {$_} | % -Begin{$i = 0} -Process{$i; $_; $i++}

Other attempts are not working either, as:

$Printers.Printers.PortHostAddress | where {$_ -ne $null} | % -Begin{$i = 0} -Process{$i; $_; $i++}
$Printers.Printers.PortHostAddress | where {$_ -ne ''} | % -Begin{$i = 0} -Process{$i; $_; $i++}

Unfortunately, when the printer's name is for example Microsoft XPS Document Writer and the value in PortHostAddress stays empty, it's still not filtered out of the list as you can see by the numbers.

Is there another way to filter out the PortHostAddress when there is no value?