Daily Planning crashes: NoReverseMatch at /daily_planning

I have no subjects yet but I do have workers, languages and flying team. It happens when I click daily planning but it refers to the sidebar.html template. I'm not sure how to track the reason of the issue. May it have something to do with the lack of subjects? @piotr.gawron @valentin.groues

Full error here: NoReverseMatch_at__daily_planning.pdf

Duplicate of #232 (closed)

Piotr says:

the problem here is that our _base templates assumes that there are some django variables available however this template is created differently than all other templates https://git-r3lab.uni.lu/NCER-PD/scheduling-system/blob/master/smash/web/urls.py#L174 and because this template is not aware of some django variables it crash