Fix error when integrating with pip (#3823)

Author: abravalheri

changelog.d/3823.misc.rst

@@ -0,0 +1 @@
+Fixes ``egg_info`` code path triggered during integration with ``pip``.

setuptools/command/egg_info.py

@@ -250,7 +250,8 @@ def finalize_options(self):
         # to the version info
         #
         pd = self.distribution._patched_dist
-        if pd is not None and pd.key == self.egg_name.lower():
+        key = getattr(pd, "key", None) or getattr(pd, "name", None)
+        if pd is not None and key == self.egg_name.lower():
             pd._version = self.egg_version
             pd._parsed_version = packaging.version.Version(self.egg_version)
             self.distribution._patched_dist = None