Feature Request - If date is blank automation

I really need an automation that will notify if a date column is blank.

Using Monday as a CRM - Every item must have a follow up scheduled unless the item is closed/dead. In the event a follow up date is left blank in error, we need to know so we can be notified.

We have an automation for dates passed. In the event a date is deleted we need to know

Adding another use case:
When a task status is marked as Done I want to set the Actual End Date as today, but ONLY if the date has not already been set by the user making the update (frequently the Actual End is in the recent past, and I want to preserve those dates.)