Fix fdo#69381 by skipping empty option groups

Change-Id: Idaf0f0a3f5430a5aea6f77a003e205116a87cc67
Reviewed-on: https://gerrit.libreoffice.org/5949Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

vcl/unx/gtk/gdi/salprn-gtk.cxx

@@ -483,6 +483,11 @@ GtkPrintDialog::impl_initCustomTab()
         GtkWidget* pGroup = NULL;
         bool bGtkInternal = false;
 
+        //Fix fdo#69381
+        //Next options if this one is empty
+        if ( aOptProp.getLength() == 0)
+            continue;
+
         for (int n = 0; n != aOptProp.getLength(); n++)
         {
             const beans::PropertyValue& rEntry(aOptProp[ n ]);