[evolution-data-server] Bug #624130 - Sasl::challenge reported failure without setting its GError

[Milan Crha <mcrha src gnome org>]

commit 0c130efaa62168ed2888ed8e141933bb113283fa
Author: Milan Crha <mcrha redhat com>
Date:   Thu Sep 2 13:27:58 2010 +0200

    Bug #624130 - Sasl::challenge reported failure without setting its GError

 camel/camel-sasl.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/camel/camel-sasl.c b/camel/camel-sasl.c
index 7e2da2b..8a616ce 100644
--- a/camel/camel-sasl.c
+++ b/camel/camel-sasl.c
@@ -282,7 +282,8 @@ camel_sasl_challenge (CamelSasl *sasl,
 	g_return_val_if_fail (class->challenge != NULL, NULL);
 
 	response = class->challenge (sasl, token, error);
-	CAMEL_CHECK_GERROR (sasl, challenge, response != NULL, error);
+	if (token)
+		CAMEL_CHECK_GERROR (sasl, challenge, response != NULL, error);
 
 	return response;
 }