Setting a default sidebar / detect if a sidebar is set

Working in custom theme and would like to get sidebar setting for page and if none is set present a default sidebar. My failed attempt is below. How do I grab the value for the page’s sidebar in my templates?

Thanks!

<?php if ( is_active_sidebar( 'sidebar-no-news' ) ) { ?>
        <div class="col-sm-4">
            <div class="side-bar row-fluid">
                <?php dynamic_sidebar( 'sidebar-no-news' ); ?>
            </div>
        </div>
	<?php } else {  ?>
    	<div class="col-sm-4">
            <div class="side-bar row-fluid">
                <?php dynamic_sidebar( 'sidebar' ); ?>
            </div>
        </div>
    <?php } ?>