Timeless is showing the language portlet correctly when are languages or
when something is added to the portlet, but it's also showing the header
even if there are no languages and nothing extra was defined.
The root cause is that when we check $this->afterLangPortlet !== '', the
property is actually null at that stage, it is only defined when we call
$this->getPortlet( 'lang' ...) in the next line.
Bug: T256355
Change-Id: Ie3e0acccede7e2f477c6182e288def8d7a35070e