FIX: Return 410 Gone for deleted topics you could otherwise see

lib/discourse.rb

@@ -43,7 +43,13 @@ module Discourse
   class InvalidParameters < StandardError; end
 
   # When they don't have permission to do something
-  class InvalidAccess < StandardError; end
+  class InvalidAccess < StandardError
+    attr_reader :obj
+    def initialize(msg=nil, obj=nil)
+      super(msg)
+      @obj = obj
+    end
+  end
 
   # When something they want is not found
   class NotFound < StandardError; end