Check off another victory for the unvanquished Rihanna, who can no longer count her platinum-selling albums on one hand. The “Diamonds” singer’s seventh album, “Unapologetic,” has now become her sixth effort to sell more than 1 million copies. The only album not to cross that threshold is her first, 2005’s “Music of the Sun.” “Unapologetic” … More Rihanna’s ‘Unapologetic’ Hits Platinum Status, Marking Singer’s Sixth Album To Do So