ensure the pin is present when focusing

for @muffinresearch, this was resulting in a blank page in webpay when entering the flow...

and the code to show the warning

![screenshot 2013-11-26 16 41 34](https://f.cloud.github.com/assets/74699/1627841/bdee3ea0-56fc-11e3-9461-2f8f3e092a36.png)