Ensure the empty check is run first and improve explanation

@Grevil: Saw this when testing it in the wild. Please merge. :)

PS: I also use "Behaviour", but "Behavior" is more common, as it seems. I guess "Behavior" is US-English, not the polite British English :P
I'm trying to learn to use "Behavior" instead.

LGTM!

Sorry, Actually NOT LGTM.

I think changing the form makes the option "Same as 'If the conditions do not match" (Default)' very confusing, as that options comes later on the form. Which for me is a bigger problem, then trying to reflect code logic on the form.

NLGTM.

As discussed, we are going to merge this, and remove the "Same as 'If the conditions do not match" option.

Automatically closed - issue fixed for 2 weeks with no activity.