Fix bugs in sub_menu

lib/parsers/parser_common.rb

@@ -111,19 +111,21 @@ module ParserCommon
   # sub_menus
   def parse_sub_menus(body = nil, page = nil, id = nil, edit=nil)
     body.css('sub_menu').each do |sub_menu|
-      menu_page = Page.find(sub_menu['id'])
+      menu_page = Page.find(sub_menu['id']) rescue nil
       res = ''
-      res << "<div class='category_list'>"
-      res << "<h3 class='h3'>#{menu_page.i18n_variable[I18n.locale]}</h3>"
-      res << "<ul class='list'>"
-      menu_page.ordered_and_visible_children.each do |child|
-        res << "<li class='#{page.id.eql?(child.id) ? 'active' : nil}'>"
-        res << "<a href='#{edit ? admin_page_path(child.id) : child.full_name}'>#{child.i18n_variable[I18n.locale]}</a>"
-        res << "</li>"
+      if menu_page && menu_page.ordered_and_visible_children.size > 0
+        res << "<div class='category_list'>"
+        res << "<h3 class='h3'>#{menu_page.i18n_variable[I18n.locale]}</h3>"
+        res << "<ul class='list'>"
+        menu_page.ordered_and_visible_children.each do |child|
+          res << "<li class='#{page.id.eql?(child.id) ? 'active' : nil}'>"
+          res << "<a href='/#{edit ? admin_page_path(child.id) : child.full_name}'>#{child.i18n_variable[I18n.locale]}</a>"
+          res << "</li>"
+        end
+        res << "</ul>"
+        res << "</h3>"
+        res << "</div>"
       end
-      res << "</ul>"
-      res << "</h3>"
-      res << "</div>"
       fragment = Nokogiri::HTML::DocumentFragment.new(body, res)
       sub_menu.swap(fragment)
     end