rt-18-archive posts have featured image

<?php
#
# rt-theme
# post content for standart post types in listing pages
#
global $rt_list_style, $more, $rt_global_post_values;


//extract global values
extract( $rt_global_post_values );

// Create thumbnail image
$thumbnail_image_output = ! empty( $featured_image_id ) ? get_resized_image_output( array( "image_url" => "", "image_id" => $featured_image_id, "w" => $featured_image_width, "h" => $featured_image_height, "crop" => $crop ) ) : "";

// Tiny image thumbnail for lightbox gallery feature
$lightbox_thumbnail = ! empty( $featured_image_id ) ? rt_vt_resize( $featured_image_id, "", 75, 50, true ) : rt_vt_resize( $featured_image_id, "", 75, 50, true );
$lightbox_thumbnail = is_array( $lightbox_thumbnail ) ? $lightbox_thumbnail["url"] : "" ;

$rt_list_style = "style3";
?>

<!-- blog box-->
<article class="blog_list loop" id="post-<?php the_ID(); ?>">

    <?php if( $rt_list_style == "style1" ):?>
    <section class="first_section">
        <div class="date_box"><span class="day"><?php the_time("d") ?></span><span class="year"><?php the_time("M") ?> <?php the_time("Y") ?></span></div>
    </section>
    <?php endif;?>


    <section class="article_section <?php if( $rt_list_style != "style1" ):?>with_icon<?php endif;?>">

        <div class="blog-head-line clearfix">

            <div class="post-title-holder">

                <!-- blog headline-->
                <?php if( $rt_list_style == "style2" ):?><h2 class="icon-pencil"><?php else:?><h2><?php endif;?><a href="<?php echo $permalink ?>" rel="bookmark"><?php the_title(); ?></a></h2>
                <!-- / blog headline-->

                <?php do_action( "post_meta_bar" )?>

            </div><!-- / end div  .post-title-holder -->

        </div><!-- / end div  .blog-head-line -->


        <?php if( ! empty( $thumbnail_image_output )  ):?>
            <div class="imgeffect align<?php echo $featured_image_position;?>">
                    <?php
                        //create lightbox link
                        do_action("create_lightbox_link",
                            array(
                                'class'          => 'icon-zoom-in lightbox_',
                                'href'           => $featured_image_url,
                                'title'          => __('Enlarge Image','rt_theme'),
                                'data_group'     => 'image_'.$featured_image_id,
                                'data_title'     => $title,
                                'data_thumbnail' => $lightbox_thumbnail,
                            )
                        );
                    ?>

                    <a href="<?php echo $permalink;?>" class="icon-link" title="<?php echo $title; ?>" rel="bookmark" ></a>

                    <?php echo $thumbnail_image_output; ?>

            </div>
        <?php endif;?>

        <?php the_excerpt( __( 'Continue reading', 'rt_theme' ) ); ?>

    </section>

</article>
<!-- / blog box-->