Minor fix

Author: pitbulk

src/onelogin/saml2/settings.py

@@ -257,9 +257,10 @@ def __add_default_values(self):
         self.__sp.setdefault('attributeConsumingService', {})
 
         self.__sp.setdefault('singleLogoutService', {})
-
         self.__sp['singleLogoutService'].setdefault('binding', OneLogin_Saml2_Constants.BINDING_HTTP_REDIRECT)
 
+        self.__idp.setdefault('singleLogoutService', {})
+
         # Related to nameID
         self.__sp.setdefault('NameIDFormat', OneLogin_Saml2_Constants.NAMEID_UNSPECIFIED)
         self.__security.setdefault('nameIdEncrypted', False)