There’s really not much to say about a picture like Step Up Revolution, the fourth of its name. If anything, I admire it for daring to be anything more than a movie about Kids With Dreams striving to realize those dreams, though that’s not saying much. Like the other Step Up films, and last year’s remake of Footloose, Step Up Revolution has one raison d’êtere, and that’s to thrill audiences with great dancing in increasingly elaborate dance numbers. Judged on that criteria alone, the film succeeds as a light, well-intentioned but charmingly dopey crowd-pleaser. Just don’t go in expecting the elements of civil disobedience captured in the marketing to add…