Set the scratch variable for the main asset as well.

lib/WebGUI/AssetExportHtml.pm

@@ -188,6 +188,8 @@ false will do nothing.
 sub exportAsHtml {
     my $self                = shift;
     my $session             = $self->session;
+    # set a scratch variable for Assets to know we're exporting
+    $session->scratch->set('isExporting', 1);
     my ($returnCode, $message);
 
     # get the i18n object