Whitespace-only value doesn't show error message?

[runnickrun]

I've read the plugin uses trim, but for some reason it doesn't work for me. E.g. name field with the value of just couple of spaces doesn't show any errors, even though it's required. Submit is disabled as intended but it's not clear since the field itself doesn't notify on any errors.

http://jsbin.com/roxasen/1/edit?html,js,output