set-cookie parameter might be missing.

Author: Roland Hedberg

src/saml2/httpbase.py

@@ -212,6 +212,8 @@ def send(self, url, method="GET", **kwargs):
             self.set_cookie(SimpleCookie(r.headers["set-cookie"]), r)
         except AttributeError:
             pass
+        except KeyError:
+            pass
 
         return r