don't try to privmsg (and then crash) if replystr is None

Module.py

@@ -215,10 +215,11 @@ class Module(object):
         return self.reply(connection, replypath, 'hello')
         """
 
-        if replypath is None:
-            return replystr
-        else:
-            connection.privmsg(replypath, replystr)
+        if replystr is not None:
+            if replypath is None:
+                return replystr
+            else:
+                connection.privmsg(replypath, replystr)
 
     def try_recursion(self, connection, event, nick, userhost, replypath, what, admin_unlocked):
         """