From 8d9d9fb06493e322c04d64b9234df0ae218e9500 Mon Sep 17 00:00:00 2001
From: Stephen Huenneke <stephen.huenneke@gmail.com>
Date: Mon, 29 Jul 2013 13:31:06 -0700
Subject: [PATCH] Fixing error return to be consistent with tuple return at the
 end of the method.

---
 requests/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/requests/models.py b/requests/models.py
index 24391533..9289f3ba 100644
--- a/requests/models.py
+++ b/requests/models.py
@@ -93,7 +93,7 @@ class RequestEncodingMixin(object):
 
         """
         if (not files) or isinstance(data, str):
-            return None
+            return (None, None)
 
         new_fields = []
         fields = to_key_val_list(data or {})