Issue Summary

When a card has a due date and we change it to a template, the due date isn't removed, just hidden. We can still see the cards while using due date filters or the dashboard view.

Steps to Reproduce

1. Create a card with an overdue due date
2. Turn the card into a template
3. Filter the board by overdue due date
4. Open the dashboard view and check the "Cards per due date" section

Expected Results

We shouldn't see templates with due date status (overdue, due soon, due later or complete) when we filter by due date or open the dashboard view.

Actual Results

The templates are shown as overdue, due soon, due later or complete.

Workaround

Change the template back to a regular card, remove the due date, and change to template again.