This was a bad news/good news kind of week for Starbucks, which got sued for allegedly shortchanging its latte customers even as it announced plans to donate all of its leftovers to charity. The class action lawsuit, filed by two customers in California, accuses the coffee chain of underfilling its lattes by 25 percent to save on the cost of milk. The news comes just weeks after the settlement of a similar lawsuit against Subway for coming up short on its footlong sandwiches. (See our March 3rd issue for more on that.) Meanwhile, Starbucks also announced the start of its long-planned initiative to donate all unsold meals to local food banks every night. The goal, Starbucks says, is to donate five million meals in the program’s first year