Check if slider contains posts

Hello,

I embedd the smotth slider in my header file:

<?php
if(function_exists("get_smooth_slider")){   get_smooth_slider($slider_id="1");
}
?>

How can I check here, if the Slider contains any posts. Because if not, and the slider is empty , I wanna display something else in the Header.

Thank you
idee

https://wordpress.org/plugins/smooth-slider/