[bpo-45765] Fix distribution discovery on empty path. (#29487)

Author: jaraco

Lib/importlib/metadata/__init__.py

@@ -748,7 +748,7 @@ def joinpath(self, child):
 
     def children(self):
         with suppress(Exception):
-            return os.listdir(self.root or '')
+            return os.listdir(self.root or '.')
         with suppress(Exception):
             return self.zip_children()
         return []

Misc/NEWS.d/next/Library/2021-11-09-09-04-19.bpo-45765.JVobxK.rst

@@ -0,0 +1 @@
+In importlib.metadata, fix distribution discovery for an empty path.