DOB Date bug? DOB Date bug!

I have noticed that when you delete a FluentCRM date, it shows as "-" in the contacts list, and internally stored as "0000-00-00", which is therefore not empty. You can save the contact with any date, and upon removing it, the list shows "-" again, therefore not empty, and prone to errors based on that date, because internally it has a date, namely "0000-00-00".

Please fix. :)