Small fix

restservice/src/main/java/com/plannaplan/controllers/AssignmentsController.java

@@ -48,7 +48,6 @@ public class AssignmentsController extends TokenBasedController {
                 elem.put("id", a.getId());
                 Groups g = a.getGroup();
                 groupInfo.put("id", g.getId());
-                groupInfo.put("id", g.getId());
                 groupInfo.put("day", g.getDay().label);
                 groupInfo.put("time", g.getTimeString());
                 groupInfo.put("lecturer", g.getLecturer().toString());