【WordPress】年別記事一覧で「年が明けたら1件も記事が無い」を回避

$retHtml='現在、'date("Y").'年のお知らせはありません。<br><a href="/'.date('Y', strtotime('-1 year')).'?post_type=info">'.date('Y', strtotime('-1 year')).'年の一覧</a>をご覧ください。';

function getList() {
 global $post;
 $oldpost = $post;
 $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
 $current_year = date('Y');
 $current_month = date('m');
 $myposts = query_posts(
array(
 'posts_per_page' => '10',
 'post_type' => 'information',
 'paged' => $paged,
 'year' => $current_year,
 'tax_query' => array(
 'relation' => 'AND',
 array(
 'taxonomy' => 'tax_group',
 'terms' => 'cats',
 'field' => 'slug',
 'operator' => 'IN',
))));
if(have_posts()):
$retHtml='';
foreach($myposts as $post) :
setup_postdata($post);

$ctm = get_post_meta($post->ID, 'TEXT', true);
if(empty($ctm)):
$retHtml.='<h3 class="tit_info"><span class="info_date">'.get_post_time('Y/m/d').'</span><a href="'.get_permalink().'">'.the_title("","",false).'</a>';
$retHtml.=do_shortcode('[New]');
$retHtml.='</h3>';
else:
$retHtml.='<h3 class="tit_info"><span class="info_date">'.get_post_time('Y/m/d').'</span> '.the_title("","",false).'';
$retHtml.=do_shortcode('[New]');
$retHtml.='</h3><div class="entry-meta">'.post_custom('TEXT').'</div>';
endif;
endforeach;

//1件も投稿がない時
else:
$retHtml='現在、'date("Y").'年のお知らせはありません。<br><a href="/'.date('Y', strtotime('-1 year')).'?post_type=info">'.date('Y', strtotime('-1 year')).'年の一覧</a>をご覧ください。';
endif;

wp_reset_query();
$post = $oldpost;
return $retHtml;
}
add_shortcode("catList", "getList");