From fd409d6d3c1ba0085ddc0bd6a981fee457d85248 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20P=C3=A9ters?= <fpeters@entrouvert.com>
Date: Sun, 22 Sep 2019 12:30:41 +0200
Subject: [PATCH] backends: accept being called with None as saml_attributes
 (#36330)

---
 mellon/backends.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mellon/backends.py b/mellon/backends.py
index 309ffb6..0e4726b 100644
--- a/mellon/backends.py
+++ b/mellon/backends.py
@@ -22,7 +22,7 @@ from . import utils
 
 class SAMLBackend(ModelBackend):
     def authenticate(self, request=None, **credentials):
-        saml_attributes = credentials.get('saml_attributes')
+        saml_attributes = credentials.get('saml_attributes') or {}
         # without an issuer we can do nothing
         if 'issuer' not in saml_attributes:
             return