If a database with at least one checkbox field is created and later this checkbox field is ommitted in the template, an exception is thrown.

Instead of an exception an error message should show up or nothing should happen at all.

 Steps to reproduce:

1. Create a new database activity
2. In this db activity create two fields e.g Name of type Shorttext and List of type Checkbox. Set both fields to be mandatory.
3. Edit the template and remove everything except the name field. You should have something like e.g.:
   Enter your name: [[Name]]
4. Go to the page where you may enter a new dataset. Only the Name field with the input text field should appear. Enter a value and press Add

Expected output: No exception should appear. It can be disussed whether an error message (mandatory field X was not set) may appear.

What actually happes: An exeption appears.