String 'None' is displayed if category description is empty

[Maxim Loginov]

Value category.description is not checked against None in the template

django-survey/survey/templates/survey/survey.html

Line 36 in 09a7c27

 <p> {{category.description}} </p> 

It would be nicer to have something like {{category.description|default_if_none:""}} there

(I would make a PR request, but I cannot test is easily)

[Pierre Sassoulas]

There's fixtures in the existing tests, you can add a null description and load the fixtures to check manually.