DES MOINES, Iowa — Some hard work and a little luck has left a handful of graduating seniors at Drake University free of any student-loan debt, and anxiety about wading into the workforce. Erin Hassanzadeh, 21, a graduating broadcast major from Bloomington, Minnesota, who has accepted a Fulbright scholarship to teach English in Korea, said she has saved wages from work she has done since she was 13. Her first job was helping out at her parents’ restaurant back home. She also got help from her parents and a generous scholarship from Drake, she said. “I’m very thankful for that,” she said.