Fixed crash when viewing assignments table as a TA
Fixed crash when viewing assignments table as a TA

Prevented the assignments table from trying to create a link that calls
submissions_controller.browse() on pr_assignments, this should be
removed once browse() is updated to handle them

arkon/Markus,arkon/Markus,benjaminvialle/Markus,reidka/Markus,arkon/Markus,reidka/Markus,reidka/Markus,MarkUsProject/Markus,reidka/Markus,benjaminvialle/Markus,MarkUsProject/Markus,arkon/Markus,MarkUsProject/Markus,MarkUsProject/Markus,benjaminvialle/Markus,benjaminvialle/Markus,reidka/Markus,reidka/Markus,benjaminvialle/Markus,benjaminvialle/Markus,benjaminvialle/Markus,reidka/Markus,MarkUsProject/Markus,arkon/Markus,arkon/Markus,MarkUsProject/Markus,arkon/Markus,MarkUsProject/Markus,arkon/Markus,reidka/Markus,arkon/Markus,MarkUsProject/Markus,reidka/Markus