Hide the search link if no tag has been searched in tag list

tpl/default/tag.list.html

@@ -13,9 +13,11 @@
   <div class="pure-u-lg-2-3 pure-u-22-24 page-form page-visitor">
     {$countTags=count($tags)}
     <h2 class="window-title">{'Tag list'|t} - {$countTags} {'tags'|t}</h2>
-    <p style="text-align: center">
-      <a href="?searchtags={$search_tags|urlencode}">{'List all links with those tags'|t}</a>
-    </p>
+    {if="!empty($search_tags)"}
+      <p class="center">
+        <a href="?searchtags={$search_tags|urlencode}">{'List all links with those tags'|t}</a>
+      </p>
+    {/if}
 
     <div id="search-tagcloud" class="pure-g">
       <div class="pure-u-lg-1-4"></div>