Possibility to cancel LookDescription by returning an empty string

[MillhioreBT]

Pull Request Prelude

• I have followed [proper The Forgotten Server code styling][code].
• I have read and understood the [contribution guidelines][cont] before making this PR.
• I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

Allow cancellation of the description message by returning an empty string.

Issues addressed: Nothing!

[ranisalt]

What happens if you actually send an empty string, is that possible? I'm thinking maybe nil would be a better value for cancelling.

[MillhioreBT]

What happens if you actually send an empty string, is that possible? I'm thinking maybe nil would be a better value for cancelling.

I also thought so although if we return nil we are not sure that a next event will not treat this parameter as a string and it would break backwards compatibility, certain scripts might throw errors that you are treating nil as a string
This is because the parameters are auto-updated on each iteration of each registered eventcallback.