Admin for questions is broken with use_session on

[caffodian]

I get something like the following:

NoReverseMatch at /admin/questionnaire/question/2/
Reverse for 'questionset' with arguments '('test:1', 1)' and keyword arguments '{}' not found. 0 pattern(s) tried: []

From what i can tell, it's because the qtesturl filter tries to reverse "questionset" named view which isn't registered when session mode is on.

[href]

Looks like this was introduced with this PR: #22

@juliomenendez You're using sessions, can you confirm this problem?