Send the full traceback with any exceptions in the queue process

util/queuefile.py

@@ -31,9 +31,15 @@ class QueueFile(object):
       if isinstance(result, Exception):
         self._closed = True
         self.raised_exception = True
+
+        handled = False
         for handler in self._exception_handlers:
           handler(result)
+          handled = True
         
+        if handled:
+          return
+
         raise result
 
       self._buffer += result