More understandable traceback for aiogram-dialog-preview

[vlkorsakov]

When I generate a dialogs preview with aiogram-dialog-preview bot.setup_dialogs:setup_dialog_registry and try to visit the site, I get a traceback: https://gist.github.com/vlkorsakov/dac34062c55426daf105f72473614062. There is not a single line mentioning in which dialog I did not set the preview data and having more than 30 dialogs it is quite difficult to figure out where I missed it, it would be nice if I got at least the window State / StatesGroup / dialog_name, but best of all I got a link to the dialog or window and a signature of which data is not enough to create a preview.