diff -r 74144b0e7858 Lib/distutils/command/upload.py
--- a/Lib/distutils/command/upload.py	Sun Mar 16 13:55:19 2014 +1000
+++ b/Lib/distutils/command/upload.py	Wed Mar 19 22:46:54 2014 +0530
@@ -79,6 +79,8 @@
             gpg_args = ["gpg", "--detach-sign", "-a", filename]
             if self.identity:
                 gpg_args[2:2] = ["--local-user", self.identity]
+            else:
+                raise DistutilsOptionError("GPG Error : Unable to find default GPG keys")
             spawn(gpg_args,
                   dry_run=self.dry_run)