The way i've gotten around this so far was the following
$a = get-nadiskowner | group owner
$globalarray = @()
$a | % {
$custom = new-object psobject
if ($_.name -eq "") { $var = "unowned"} else { $var = $_.name}
add-member -inputobject $custom -membertype noteproperty -name "Filer" -value $var
add-member -inputobject $custom -membertype noteproperty -name "# of Drives" -value $_.count
$globalarray += $custom
}
$global | ft -autosize
Filer # of Drives
----- -----------
filera 76
filerb 83
unowned 24