use an empty array if there are no aliases to export (#18981)

Author: isra-fel

src/Marketplace/Marketplace/Az.Marketplace.psd1

@@ -100,7 +100,7 @@ CmdletsToExport = 'Get-AzMarketplacePrivateStore',
 # VariablesToExport = @()
 
 # Aliases to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no aliases to export.
-AliasesToExport = ''
+AliasesToExport = @()
 
 # DSC resources to export from this module
 # DscResourcesToExport = @()