From 708e992ab3e6c26d478283fc11faa6a0a74bfec0 Mon Sep 17 00:00:00 2001
From: ppretorius <pierre@labs.epiuse.com>
Date: Mon, 27 Jan 2014 14:21:49 +0200
Subject: [PATCH] Allow expecting a parameter to be nil during return_to
 verification.

---
 lib/openid/consumer/idres.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/openid/consumer/idres.rb b/lib/openid/consumer/idres.rb
index 0318df0d..16c1d809 100644
--- a/lib/openid/consumer/idres.rb
+++ b/lib/openid/consumer/idres.rb
@@ -160,7 +160,7 @@ def verify_return_to_args(msg_return_to)
         query = @message.to_post_args
         return_to_parsed_query.each_pair do |rt_key, rt_val|
           msg_val = query[rt_key]
-          if msg_val.nil?
+          if msg_val.nil? && !rt_val.nil?
             raise ProtocolError, "Message missing return_to argument '#{rt_key}'"
           elsif msg_val != rt_val
             raise ProtocolError, ("Parameter '#{rt_key}' value "\