Make sure to not sieve on_stop hooks

Author: linuxdaemon

cloudbot/plugin.py

@@ -445,7 +445,7 @@ def launch(self, hook, event):
         :rtype: bool
         """
 
-        if hook.type not in ("on_start", "periodic"):  # we don't need sieves on on_start hooks.
+        if hook.type not in ("on_start", "on_stop", "periodic"):  # we don't need sieves on on_start hooks.
             for sieve in self.bot.plugin_manager.sieves:
                 event = yield from self._sieve(sieve, event, hook)
                 if event is None: