Display information that no event was found

[lycis]

When querying a client that does not exist or events for a client that currently has no events there is simply no reply. I think it would be better if there would be a reply like "no current events" so that I know that there is just nothing to display.

[jlambert121]

This sounds like a great improvement. I believe the API returns an error of "no such client" or something like that so that just needs to be caught and returned to the chat. I'm not currently using this so I don't have a way to test it, but I'd love a PR!