update

Author: jiasli

src/azure-cli/azure/cli/command_modules/role/_msgrpah/_graph_client.py

@@ -58,8 +58,8 @@ def _send(self, method, url, param=None, body=None, api_version=V1_0):
                                      body=body)
             except HTTPError as ex:
                 err = ex.response.json()['error']
-                code = err['code']
-                message = err['message']
+                code = err.get('code') or ''
+                message = err.get('message') or ''
                 raise GraphError(f"({code}) {message}", ex.response) from ex
             # Other exceptions like AuthenticationError should not be handled here, so we don't catch CLIError