FIX: properly filter whispers in user stream

lib/guardian/post_guardian.rb

@@ -147,7 +147,7 @@ module PostGuardian
     return false if post.blank?
     return true if is_admin?
     return false unless can_see_topic?(post.topic)
-    return false unless post.user == @user || post.topic.visible_post_types(@user).include?(post.post_type)
+    return false unless post.user == @user || Topic.visible_post_types(@user).include?(post.post_type)
     return false if !is_moderator? && post.deleted_at.present?
 
     true

lib/topic_view.rb

@@ -331,7 +331,7 @@ class TopicView
   private
 
   def filter_post_types(posts)
-    visible_types = @topic.visible_post_types(@user)
+    visible_types = Topic.visible_post_types(@user)
 
     if @user.present?
       posts.where("user_id = ? OR post_type IN (?)", @user.id, visible_types)