I'm not sure but I think it was to do with Memorial Day Weekend, last year, they dropped loads of viewers on it, so decided to just skip it this week.
Bloody memorial weekend, whatever that is. They aired an episode on that weekend last year and it lost 500,000 viewers so now they're just skipping it.
Ahh ok cheers. Thankfully it's just one weekend and not a mid-season break like they did with TWD, now that's annoying!
Apparently identified by their underpants visible above their low slung trousers (that's a crime in itself).