Bug 9046: Followup FIX perl v.10 raises an error if itemnumbers if undefined

If the itemnumbers parameter is undef, perl raises an error :
"Can't use an undefined value as an ARRAY reference"

Signed-off-by: Mason James <mtj@kohaaloha.com>

C4/Biblio.pm

@@ -2841,6 +2841,8 @@ sub EmbedItemsInMarcBiblio {
     my ($marc, $biblionumber) = @_;
     croak "No MARC record" unless $marc;
 
+    $itemnumbers = [] unless defined $itemnumbers;
+
     my $frameworkcode = GetFrameworkCode($biblionumber);
     _strip_item_fields($marc, $frameworkcode);