Related: tdf#158534 set fallback help page for optional print content

Change-Id: I79d843cbf2591ab5a8625087e2ec5897b26a8056
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160371
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>
diff --git a/vcl/source/window/printdlg.cxx b/vcl/source/window/printdlg.cxx
index 3c1f5d0..9c5f519 100644
--- a/vcl/source/window/printdlg.cxx
+++ b/vcl/source/window/printdlg.cxx
@@ -1330,6 +1330,7 @@ void PrintDialog::setupOptionalUI()
            rOption.Value >>= sOptionsUIFile;
            mxCustomOptionsUIBuilder = Application::CreateBuilder(mxCustom.get(), sOptionsUIFile);
            std::unique_ptr<weld::Container> xWindow = mxCustomOptionsUIBuilder->weld_container("box");
            xWindow->set_help_id("vcl/ui/printdialog/PrintDialog");
            xWindow->show();
            continue;
        }