Hallmark will debut “The Courageous Heart of Irena Sendler” on Sunday April 19 at 9/8c. Based on the true story of a social worker who saved 2,500 Jewish children during the German occupation of Poland, the movie examines how she risked her own life to save thousands of others. As a Catholic social worker, Sendler gained access to the Warsaw ghetto and was angry at the conditions and treatment she was witnessing....