disable tags param if empty

app/presenters/post_presenter.rb

@@ -16,7 +16,7 @@ class PostPresenter < Presenter
     path = options[:path_prefix] || "/posts"
     
     html =  %{<article class="post-preview" id="post_#{post.id}" data-id="#{post.id}" data-tags="#{h(post.tag_string)}" data-uploader="#{h(post.uploader_name)}" data-rating="#{post.rating}" data-width="#{post.image_width}" data-height="#{post.image_height}" data-flags="#{flags.join(' ')}" data-parent-id="#{post.parent_id}" data-has-children="#{post.has_children?}" data-score="#{post.score}">}
-    if options[:tags]
+    if options[:tags].present?
       tag_param = "?tags=#{CGI::escape(options[:tags])}"
     elsif options[:pool_id]
       tag_param = "?pool_id=#{options[:pool_id]}"