Add exception_type to reports model as well.

Signed-off-by: Dhananjay Nakrani <dhananjaynakrani@gmail.com>
Display 'exception_type' in the list view of Reports.

Signed-off-by: Dhananjay Nakrani <dhananjaynakrani@gmail.com>
TESTING: Solve 'PDOExceptions'.

Signed-off-by: Dhananjay Nakrani <dhananjaynakrani@gmail.com>