store the JWT token in current object if available

src/oic/oauth2/__init__.py

@@ -824,6 +824,9 @@ class Client(PBase):
             else:
                 if "key" not in kwargs and "keyjar" not in kwargs:
                     kwargs["keyjar"] = self.keyjar
+
+                if 'id_token' in resp:
+                    self.id_token = resp['id_token']
                 verf = resp.verify(**kwargs)
                 if not verf:
                     raise PyoidcError("Verification of the response failed")