Exporting to CSV not getting all the information

I am trying to get computer information from remote computers and then put it in excel.  For the most part  its working but I'm trying to include the info in the else scriptblock to but I can't seem to make that happen here is the script.

Function Get-Compinfo {

 [CmdletBinding()]

    Param(

        [Parameter (ValueFromPipeline=$true,

                    ValueFromPipelineByPropertyName=$true)]

        [Alias("HostName","CN")]

        [String[]]$ComputerName= 'LocalHost',

            )

    Begin{}

    Process {   

ForEach ($Client in $ComputerName) {

if (Test-Connection -Computername $client -BufferSize 16 -Count 1 -Quiet) {

    $System = Get-WmiObject -Class Win32_ComputerSystem -ComputerName $Client

            $Bios     = Get-WmiObject -Class Win32_Bios -ComputerName $Client

            $os=Get-Wmiobject -ComputerName $Client -Class Win32_OperatingSystem

            $Disk=Get-WmiObject -ComputerName $Client -class Win32_LogicalDisk -filter "DeviceID='c:'"

            $Prop=[Ordered]@{

                'ComputerName'=$System.Name;

                'Manufacturer'=$System.Manufacturer;

                'Model'=$System.Model;

                'Username'=$System.Username;

                'OS Name'=$os.caption;

                'OSBit'=$OS.OSArchitecture;

                'Service Pack'=$os.Servicepackmajorversion;

                'Serial Number'=$Bios.SerialNumber

                'DiskSize(c:)'=$Disk.Size / 1gb -as [int];

                'FreeSpace'=$Disk.Freespace / 1gb -as [int]

            }

        $Obj=New-Object -TypeName PSObject -Property $Prop 

       Write-Output $Obj

    }

Else {"$Client is notonline"}

        }

    }

    End {} 

}

Here is the Info I get by just running it in the shell.  It looks fine, but when I export it is when I get the issue.  where it says tms-601-ws01 is notonline will not show up in excel just a blank shell. I'm sure I'm not doing something right I pretty new to powershell.

PS D:\Documents\Powershell> Get-Compinfo -ComputerName (Get-Content D:\Documents\Powershell\computers.txt)

ComputerName  : THS-AD2

Manufacturer  : Dell Inc.

Model         : PowerEdge R320

Username      : 

OS Name       : Microsoft Windows Server 2012 R2 Standard

OSBit         : 64-bit

Service Pack  : 0

Serial Number : 

DiskSize(c:)  : 195

FreeSpace     : 183

tms-601-ws01 is notonline

ComputerName  : TMS2

Manufacturer  : Dell Computer Corporation

Model         : PowerEdge 1800

Username      : 

OS Name       : Microsoft(R) Windows(R) Server 2003, Standard Edition

OSBit         : 

Service Pack  : 2

Serial Number :

DiskSize(c:)  : 12

FreeSpace     : 1

notonline is notonline

ComputerName  : 

Manufacturer  : Hewlett-Packard

Model         : HP Compaq Pro 6300 All-in-One PC

Username      : 

OS Name       : Microsoft Windows 8.1 Pro

OSBit         : 64-bit

Service Pack  : 0

Serial Number :

DiskSize(c:)  : 232

FreeSpace     : 160

Any help would be appreciated

Sorry Kinda long