Guestbook custom questions limited to 255 chars and creating one fails silently if you go over that limit

[qqmyers]

What steps does it take to reproduce the issue?
Per the title, trying to create/edit a guestbook with more than 255 chars in a custom question results in a success message but no change. The underlying limit is due to the column type varchar(255). The error failure appears to be due to a missing return statement when the CommandException is caught, allowing the code to create and send the success message to run.

PR to follow