+unless ( $biblionumber ) {
+ # Retrieving the biblio from the imagenumber
+ my $image = Koha::CoverImages->find($imagenumber);
+ my $item = Koha::Items->find($image->{itemnumber});
+ $biblionumber = $item->biblionumber;
+}
+my $biblio = Koha::Biblios->find( $biblionumber );