Admin menu with 1 submenu item does not show the subitem.

[tzyganu]

Version
Magento2-0.74.0-beta9

Steps to reproduce
I'm creating my own extension for learning purposes and this should add a new menu item in the backend with a single submenu item.

This is the code from my module's adminhtml/menu.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../Magento/Backend/etc/menu.xsd">
    <menu>
        <add id="Sample_News::news" title="News" module="Sample_News" sortOrder="63" resource="Sample_News::news"/>
        <add id="Sample_News::author" title="Authors" module="Sample_News" sortOrder="10" action="sample_news/author" resource="Sample_News::author" parent="Sample_News::news"/>
    </menu>
</config>

Expected result
I should see my menu item in the backend and when clicking on it I should see a submenu with 1 item

Actual result
I see my main menu, but when clicking it there is just an empty submenu

Note
The problem does not appear if I add a second submenu item to my main menu item.

Posible fix

I noticed that if I change the in method Magento\Backend\Block\Menu::renderNavigation this line

if (count($menu) > 1 || $level != 1) {

to this

if (count($menu) > 0 || $level != 1) {

my menu appears as expected.

[anupdugar]

@tzyganu Thanks for reporting this bug. I have created an issue MAGETWO-37904 to track and get it fixed.

[vpelipenko]

@tzyganu, the fix is available from 0.74.0-beta13. Could you check it on the latest version?

[tzyganu]

@vpelipenko It seams to work fine now. Thanks for the quick fix.