Display an error message listing empty feeds

Feeds are considered empty if there is no items (read/unread) associated to them and if they have already been check.

It would be good to display something about it. I am not sure it is a good idea to display it in the list of subscription (maybe we could display it in preference section).

Whate do you think of it ?

A suite to this could be the display of the reason of error for each concerned subscription.