Avoid duplication in setuptools.dist

Author: abravalheri

setuptools/dist.py

@@ -984,10 +984,10 @@ def _setuptools_commands() -> set[str]:
     try:
         # Use older API for importlib.metadata compatibility
         entry_points = metadata.distribution('setuptools').entry_points
-        eps = (ep.name for ep in entry_points)
+        eps: Iterable[str] = (ep.name for ep in entry_points)
     except metadata.PackageNotFoundError:
         # during bootstrapping, distribution doesn't exist
-        return set(distutils.command.__all__)
+        eps = []
     return {*distutils.command.__all__, *eps}