Form validation errors close the window

[foobarbecue]

Thanks for the great plugin!

One issue I ran into was that if I forgot to fill in the required input in the form and clicked go, I get an error ("No method chosen," "No option chosen" etc.) and then the plugin closes. When I re-open it, the form is blank. It would be nice if instead of closing the form, it would send me back to it with my selections still there.

I would be interested in submitting a PR to make this fix, as my first contribution to the plugin. I probably have time to do it this weekend.

[mauroalberti]

Hi,
sorry for the late replay.
It would be great if you could submit a pull..