Remove class that was only useful with Sphinx autodoc

diff --git a/Lib/packaging/metadata.py b/Lib/packaging/metadata.py
index 53d91f745156c1f82b8b2f33d1a270519cce7f02..104600b54e98b64e6cc953a60389881addb64be5 100644 (file)
--- a/Lib/packaging/metadata.py
+++ b/Lib/packaging/metadata.py
@@ -182,14 +182,6 @@ _UNICODEFIELDS = ('Author', 'Maintainer', 'Summary', 'Description')
 _MISSING = object()
 
 
-class NoDefault:
-    """Marker object used for clean representation"""
-    def __repr__(self):
-        return '<NoDefault>'
-
-_MISSING = NoDefault()
-
-
 class Metadata:
     """The metadata of a release.