Improve Workspace project scheduling: email addresses that are not whitelisted

When a user fills in the project schedule dialog and enters the email address that is not whitelisted in the Company Settings, no any notification appears. After clicking on the Schedule button, nothing happens either, no any notification about failure is displayed.

Please display a notification when a list of recipients contains an email address the project can't be delivered to. This warning will help AA users to understand that the project will be schedule only if the email will be whitelisted or removed from the recipients list.