From 96da4d38eb60c3971ca88df9383e09d53493cf1e Mon Sep 17 00:00:00 2001
From: Myle Ott <myleott@fb.com>
Date: Thu, 28 Jan 2021 14:18:48 -0800
Subject: [PATCH] Small Hydra fix (#1543)

Summary: Pull Request resolved: https://github.com/fairinternal/fairseq-py/pull/1543

Test Plan: Imported from OSS

Reviewed By: girifb

Differential Revision: D25836852

Pulled By: myleott

fbshipit-source-id: 7fda711d21f2d1b7bac26792233997e8dea2f835
---
 fairseq/dataclass/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fairseq/dataclass/utils.py b/fairseq/dataclass/utils.py
index 401c212ecc..a4d4a412dd 100644
--- a/fairseq/dataclass/utils.py
+++ b/fairseq/dataclass/utils.py
@@ -162,7 +162,7 @@ def get_kwargs_from_dc(
                     continue
                 else:
                     del kwargs["default"]
-            if delete_default:
+            if delete_default and "default" in kwargs:
                 del kwargs["default"]
         try:
             parser.add_argument(*field_args, **kwargs)