add tags to posts_list_item for topics (#557)

templates/partials/posts_list_item.tpl

@@ -10,6 +10,16 @@
 
         <small class="topic-category"><a href="{config.relative_path}/category/{../category.slug}">[[global:posted_in, {../category.name}]]</a></small>
 
+        {{{ if ../isMainPost }}}
+        {{{ if ../topic.tags.length }}}
+        <span class="tag-list">
+            {{{ each ../topic.tags }}}
+            <a href="{config.relative_path}/tags/{topic.tags.valueEncoded}"><span class="tag tag-item tag-class-{topic.tags.class}">{topic.tags.valueEscaped}</span></a>
+            {{{ end }}}
+        </span>
+        {{{ end }}}
+        {{{ end }}}
+
         <div class="post-info">
             <a href="{config.relative_path}/user/{../user.userslug}">{buildAvatar(../user, "md", true, "user-img not-responsive")}</a>