FEATURE REQUEST: Limit Error/Help display to Admin users

EXISTING FUNCTIONALITY
The error message displayed when trying to show a non-existent widget is very helpful. However, it is displayed to all visitors, not just logged-in admins.

FEATURE REQUEST
I believe showing the error to admins and showing nothing to everyone else would be the best behavior.

WHY?
It should be fairly obvious that displaying nothing is better than displaying an error to a visitor. It would be very easy, when dealing with a large site especially, to remove a widget and forget to remove the shortcode. If this feature were added to the plugin, I’d feel much safer using it.

Thanks for considering this feature request.