What happens when I enable a responsive image override but leave the image empty?

In supported SW modules, turning on a Desktop, Tablet, or Mobile image override and leaving its image empty intentionally hides that photo at the selected breakpoint and smaller sizes. A smaller-breakpoint override with its own file can bring the photo back for that size. This behavior is documented for responsive Outer and Inner images in SW Hero, SW Cards, SW Pillar Slides, SW Testimonials, and SW Footer Columns. In SW Pillar Section, an empty secondary-image override also collapses the media column so the content can use the full width; an empty Extra Large image still uses the editor placeholder.