old_contents: from django import template
  from django.utils.translation import ugettext_lazy as _
  from django.db.models import Count
  
  register = template.Library()
  
  @register.filter
  def genre(value):
      genred = dict([
          (0, _("Albatross")),
          (1, _("20th-Door")),
          (2, _("Little Albat")),
          (3, _("Others & Formal"))])
      return genred[value]
  
  @register.filter
  def normalize_star(value):
      return '%.1f' % ((value+5)*10)
  
  @register.filter
  def get_unanswered(value):
      try:
          return value.filter(kaitou="").aggregate(Count('id'))['id__count']
      except:
          return 0
  
new_contents: from django import template
  from django.utils.translation import ugettext_lazy as _
  from django.db.models import Count, Q
  
  register = template.Library()
  
  @register.filter
  def genre(value):
      genred = dict([
          (0, _("Albatross")),
          (1, _("20th-Door")),
          (2, _("Little Albat")),
          (3, _("Others & Formal"))])
      return genred[value]
  
  @register.filter
  def normalize_star(value):
      return '%.1f' % ((value+5)*10)
  
  @register.filter
  def get_unanswered(value):
      try:
          return value.filter(Q(kaitou="") | Q(kaitou__isnull=True)).aggregate(Count('id'))['id__count']
      except:
          return 0
  
subject: Fix excluded null values