fix lint problem

Author: shokakucarrier

charon/pkgs/radas_signature_handler.py

@@ -80,7 +80,7 @@ def on_start(self, event: Event) -> None:
             url=rconf.umb_target(),
             ssl_domain=ssl_domain
         )
-        self.receiver = event.container.create_receiver(
+        event.container.create_receiver(
             self.conn, rconf.result_queue(), dynamic=True
         )
         logger.info("Listening on %s, queue: %s", rconf.umb_target(), rconf.result_queue())
@@ -152,6 +152,7 @@ def __init__(self, payload: str):
         self.payload = payload
         self.container = None
         self.conn = None
+        self.sender = None
 
     def on_start(self, event):
         """
@@ -187,7 +188,8 @@ def on_sendable(self):
         """
         request = self.payload
         msg = Message(body=request)
-        self.sender.send(msg)
+        if self.sender:
+            self.sender.send(msg)
         if self.container:
             self.container.stop()