Cannot set expiry to <none> after accidentally clicking on the expiry dialog button

[GoogleCodeExporter]

What steps will reproduce the problem?
1. create key
2. when creating touch the expiry button
3. A expiry date chooser dialog is presented. Now no matter what you do, you 
cannot go back to <none> state

What is the expected output? What do you see instead?
I must be able to select <none> from the dialog to make the key to never expire

What version of the product are you using? On what operating system?
Latest from Play

Please provide any additional information below.

Original issue reported on code.google.com by bhas...@unixindia.com on 3 Feb 2014 at 6:00