add empty view picture

[oryanm]

preferably a pic of trello's husky

[ryanbuening]

Hey! Love the widget!

I'm not sure if this widget is still being maintained/developed, but I came here to propose an empty view modification as well.

I think it would be nice to have the option to change the text from "No more cards!" to display custom text that the user enters, or maybe even nothing at all.