From 6be7a46a36c06f80e10565b74dbf0f44a6f4656a Mon Sep 17 00:00:00 2001
From: Helmut Grohne <helmut@subdivi.de>
Date: Sat, 12 Jul 2008 14:59:29 +0200
Subject: optimize adapter to not mangle data when unnecessary

---
 wsgitools/adapters.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/wsgitools/adapters.py b/wsgitools/adapters.py
index 5a4983b..6f9c203 100644
--- a/wsgitools/adapters.py
+++ b/wsgitools/adapters.py
@@ -48,6 +48,8 @@ class WSGI1to2Adapter:
             return write_callable
         iterable = self.app(environ, start_response)
         assert hasattr(iterable, "__iter__")
+        if not results[2]:
+            return results[0], results[1], iterable
         if isinstance(iterable, list):
             # retaining .close attribute this way
             iterable[:0] = results[2]
-- 
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