Michael Hudson fixes a case where execv() is called (for a test) with

an empty argument list -- another patch he's checking in will make
this illegal (the first argument should always be the program name).

Lib/os.py

@@ -252,7 +252,7 @@ def _execvpe(file, args, env=None):
     if not _notfound:
         import tempfile
         # Exec a file that is guaranteed not to exist
-        try: execv(tempfile.mktemp(), ())
+        try: execv(tempfile.mktemp(), ('blah',))
         except error, _notfound: pass
     exc, arg = error, _notfound
     for dir in PATH: