Update task.py

The `throw` behaviour should be honored in 'eager' mode as well.

celery/app/task.py

@@ -595,6 +595,8 @@ class Task(object):
             # if task was executed eagerly using apply(),
             # then the retry must also be executed eagerly.
             S.apply().get()
+            if throw:
+                raise ret
             return ret
 
         try: