Powershell 2.0 random $null addition from Add-Member - arrays

Question

My goal is to save some info into a variable that later will be written out ($Server).
I have created a cmdlet that gets some info from the CPU, which gives me the result i want to add into my server variable.
When i add it i get a $null value.
PS C:\> $CPU = Get-CPUInfo -Computername .
PS C:\> $CPU
CPUSpecification CPUCurrentClockSpeed CPUMaxClockSpeed Socket
---------------- -------------------- ---------------- ------
Intel(R) Core(TM) i5-6200U CPU # 2.30GHz 2300 2400 {#{SocketDesignation=U3E1; NumberOfCores=2; NumberOfLogicalProcessors=4}}
PS C:\> $Server = New-Object PSObject
PS C:\> Add-Member -InputObject $Server -MemberType NoteProperty -Name "CPU" -Value $CPU
PS C:\> $Server
CPU
---
{$null, #{CPUSpecification=Intel(R) Core(TM) i5-6200U CPU # 2.30GHz; CPUCurrentClockSpeed=2300; CPUMaxClockSpeed=2400; Socket=System.Object[]}}
PS C:\>
I would like to know why i get this $null inside, and how do i change it if it is some usefull information?
Later on i will create a .json file that stores my $Server variable, and it also saves the null value inside there.
I really do not like the idea of my users recieving null values where none are expected.
EDIT:
I have made this custom Get-CPUInfo cmdlet that i use, however it gives me what i need and no $null value:
function Get-CPUInfo
{
[CmdletBinding()]
Param
(
# Name of the computer to get version from
[Parameter(Mandatory=$true,
ValueFromPipeline=$true,
ValueFromPipelineByPropertyName=$true,
Position=0)]
[ValidateNotNull()]
[ValidateNotNullOrEmpty()]
[Alias("CN", "Host", "HostName")]
[string]$Computername
)
$MySocket = Get-WmiObject -Class Win32_Processor -ComputerName $ComputerName
$IsSocketArray = $MySocket -is [system.array]
$SocketInfo
$SocketInfoArray = #()
if(-not $IsSocketarray)
{
$SocketInfo = New-Object PSObject
Add-Member -InputObject $SocketInfo -MemberType NoteProperty -Name "SocketDesignation" -Value $MySocket.SocketDesignation
Add-Member -InputObject $SocketInfo -MemberType NoteProperty -Name "NumberOfCores" -Value $MySocket.NumberOfCores
Add-Member -InputObject $SocketInfo -MemberType NoteProperty -Name "NumberOfLogicalProcessors" -Value $MySocket.NumberOfLogicalProcessors
$SocketInfoArray += $SocketInfo
}
else
{
foreach ($s in $MySocket)
{
$SocketInfo = New-Object PSObject
Add-Member -InputObject $SocketInfo -MemberType NoteProperty -Name "SocketDesignation" -Value $s.SocketDesignation
Add-Member -InputObject $SocketInfo -MemberType NoteProperty -Name "NumberOfCores" -Value $s.NumberOfCores
Add-Member -InputObject $SocketInfo -MemberType NoteProperty -Name "NumberOfLogicalProcessors" -Value $s.NumberOfLogicalProcessors
$SocketInfoArray += $SocketInfo
}
}
$CPUSpecification = if($IsSocketarray){ $MySocket[0].Name} else{ $MySocket.Name}
$CPUCurrentClockSpeed = if($IsSocketarray){ $MySocket[0].CurrentClockSpeed} else{ $MySocket.CurrentClockSpeed}
$CPUMaxClockSpeed = if($IsSocketarray){ $MySocket[0].MaxClockSpeed} else{ $MySocket.MaxClockSpeed}
$CPUInfo = New-Object PSObject
Add-Member -InputObject $CPUInfo -MemberType NoteProperty -Name "CPUSpecification" -Value $CPUSpecification
Add-Member -InputObject $CPUInfo -MemberType NoteProperty -Name "CPUCurrentClockSpeed" -Value $CPUCurrentClockSpeed
Add-Member -InputObject $CPUInfo -MemberType NoteProperty -Name "CPUMaxClockSpeed" -Value $CPUMaxClockSpeed
Add-Member -InputObject $CPUInfo -MemberType NoteProperty -Name "Socket" -Value $SocketInfoArray
return $CPUInfo
}

Answer 1

PowerShell doesn't print null elements of an array when you display it directly, but it'll be printed in a compact representation of properties.
Let's check:
(Get-CPUInfo -Computername .).GetType()
Object[] System.Array
(Get-CPUInfo -Computername .).Count
2
(Get-CPUInfo -Computername .)[0] -eq $null
True
Something outputs a null value in the Get-CPUInfo function:
$SocketInfo
Remove it.