Made the old callbacks die before the new callbacks are loaded.

src/privmsgs.py

@@ -279,13 +279,13 @@ class OwnerCommands(CapabilityCheckingPrivmsg):
         name = getArgs(args)
         callbacks = irc.removeCallback(name)
         if callbacks:
+            for callback in callbacks:
+                callback.die()
             try:
                 moduleInfo = imp.find_module(name)
                 module = imp.load_module(name, *moduleInfo)
                 callback = module.Class()
                 irc.addCallback(callback)
-                for callback in callbacks:
-                    callback.die()
                 irc.reply(msg, conf.replySuccess)
             except ImportError:
                 for callback in callbacks: