Added Josselin Jacquard to AUTHORS

AUTHORS

@@ -42,3 +42,4 @@ Patches and Suggestions
 - Alejandro Giacometti
 - Rick Mak
 - Johan Bergström
+- Josselin Jacquard

requests/utils.py

@@ -150,8 +150,10 @@ def get_encoding_from_headers(headers):
     """
 
     content_type = headers.get('content-type')
-    if not content_type :
-        return
+
+    if not content_type:
+        return None
+
     content_type, params = cgi.parse_header(content_type)
 
     if 'charset' in params: