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>
Merge pull request #48 from dhananjay92/dhananjay-gsoc-dev2

Solve [Issue#46]: Display Exception Type on list view of Reports