Fix course perms

apps/course/views.py

@@ -185,7 +185,7 @@ class CourseView(DetailView):
     def get(self, request, *args, **kwargs):
         response = super().get(request, *args, **kwargs)
         context = self.get_context_data()
-        if (not request.user.is_authenticated and self.object.status != Course.PUBLISHED) or\
+        if not request.user.is_authenticated or (not request.user.is_authenticated and self.object.status != Course.PUBLISHED) or\
                 (request.user.is_authenticated and request.user.role not in [User.AUTHOR_ROLE, User.ADMIN_ROLE] and self.object.author != request.user and self.only_lessons and not context['paid']):
             raise Http404
         return response