There may be two kinds of bookcase owners: those who own more books than they can accommodate, cramming tomes into every crevice – and those who dot their shelves with artfully placed stacks, and have space to burn on potted plants and framed photos. And then there’s Ashley Tisdale, whose bookshelves are just empty. The High School Musical star recently went viral for admitting to Architectural Digest that she had rushed to fill the in-built shelves in her Hollywood Hills home specifically for an on-camera tour. “These bookshelves, I have to be honest, actually did not have books in [them] a couple of days ago,” Tisdale said. “I had my…