Restart external auth process if process not found

[GoogleCodeExporter]

What steps will reproduce the problem?
1. kill external auth process
2. connect server with xmpp client
3. external auth process not properly restarted

What is the expected output? What do you see instead?
Client connection failed

What version of the product are you using? On what operating system?
0.9.4

Please provide any additional information below.
It is suggested to remove the line 59: "return nil;" to fall through the code 
to restart the external auth process.

Original issue reported on code.google.com by twhtan...@gmail.com on 22 Aug 2014 at 1:50