Prevent issues with menu creation and subsequent pane focus from menu bar by preventing menus from being created from an empty array. I can't conceive a valid use case for this, since if one wants to remove a menu they should be be passing null to win.setMenu() or calling win.removeMenu(). This issue is also specific to top-level menus, and not submenus, so the new check and exception is scoped to top-level menus.
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