menus: fix "Hierarchical menu problem" as reported in http://lively-web.org/issues/14-10-25_Hierarchical_menu_problem.html
menus: fix "Hierarchical menu problem" as reported in http://lively-web.org/issues/14-10-25_Hierarchical_menu_problem.html

NikolaySuslov/LivelyKernel,pascience/LivelyKernel,LivelyKernel/LivelyKernel,LivelyKernel/LivelyKernel,NikolaySuslov/LivelyKernel,NikolaySuslov/LivelyKernel,pascience/LivelyKernel,LivelyKernel/LivelyKernel,pascience/LivelyKernel