Remove extraneous try/except (#1247)

The exception handling block was raising the caught exception in-place, which caused the original traceback info to be lost. Rather than replace `raise e` with `raise`, I simply removed the whole try / except, since no action was being taken in the except block.

rq/worker.py

@@ -747,15 +747,10 @@ class Worker(object):
         # that are different from the worker.
         random.seed()
 
-        try:
         self.setup_work_horse_signals()
         self._is_horse = True
         self.log = logger
         self.perform_job(job, queue)
-        except Exception as e:  # noqa
-            # Horse does not terminate properly
-            raise e
-            os._exit(1)
 
         # os._exit() is the way to exit from childs after a fork(), in
         # contrast to the regular sys.exit()