fixes

app/models/post.rb

@@ -609,7 +609,7 @@ class Post < ActiveRecord::Base
       else
         count = get_count_from_cache(tags)
       
-        if count.nil? || count == 0
+        if count.to_i == 0
           count = fast_count_search(tags)
         end
       end

app/views/forum_topics/index.html.erb

@@ -26,7 +26,7 @@
               <%= link_to topic.title, forum_topic_path(topic) %>
 
               <% if topic.response_count > Danbooru.config.posts_per_page %>
-                <%= link_to "last", forum_topic_path(topic, :page => topic.last_page), :class => "last-page" %>
+                <%= link_to "pg #{topic.last_page}", forum_topic_path(topic, :page => topic.last_page), :class => "last-page" %>
               <% end %>
 
               <% if topic.is_locked? %>