python - Django. I need variables from my own context processor only when user is authenticated -

i have django 1.8.13. need variables own context processor when user authenticated. context processor:

def comment_rew(request):    context_dict = {}    if request.user.is_authenticated():       user = request.user       user_rew = user.review_set.all().count()       context_dict['user_rew'] = user_rew    return(context_dict) 

when user not authenticated returns empty dictionary , causes error(because context processor can't returns empty dict). possible use context processor if user authenticated?

context processors can't enabled/disabled based on authentication status of users.

you can instead set value of context variable user_rew none when users not authenticated:

def comment_rew(request):     context_dict = {'user_rew': none}     if request.user.is_authenticated():         user = request.user         user_rew = user.review_set.all().count()         context_dict['user_rew'] = user_rew     return context_dict