<?php
$subway_revslider = get_post_meta( subway_qode_get_page_id(), "qode_revolution-slider", true );

if ( ! empty( $subway_revslider ) ) { ?>
    <div class="slider">
        <div class="slider_inner">
            <?php echo do_shortcode( $subway_revslider ); ?>
        </div>
    </div>
    <?php
}
?>