Initializing the partitions list as an empty array

src/windows/common/helpers/Get-Disk-Partitions.ps1

@@ -1,6 +1,6 @@
 function Get-Disk-Partitions()
 {
-	$partitionlist = $null
+	$partitionlist = @()
 	$disklist = get-wmiobject Win32_diskdrive |Where-Object {$_.model -like 'Microsoft Virtual Disk'} 
 	ForEach ($disk in $disklist)
 	{
@@ -14,4 +14,4 @@ function Get-Disk-Partitions()
 		$partitionlist += Get-Partition -DiskNumber $diskID
 	}
 	return $partitionlist
-}
+}