Merge pull request #42 from davidtaylorhq/filter_parameters

Check discourse version before adding TopicQuery filters

plugin.rb

@@ -337,6 +337,7 @@ SQL
     end
   end
 
+  if Discourse.has_needed_version?(Discourse::VERSION::STRING, '1.8.0.beta6')
     require_dependency 'topic_query'
 
     TopicQuery.add_custom_filter(:solved) do |results, topic_query|
@@ -357,6 +358,7 @@ SQL
       end
       results
     end
+  end
 
   require_dependency 'topic_list_item_serializer'