old_contents: from django.contrib import admin
  from django import forms
  
  # DJANGAE
  from djangae.contrib.gauth.datastore.models import (
      GaeDatastoreUser,
      Group
  )
  
  class UserAdminForm(forms.ModelForm):
      username = forms.CharField(required=False)
  
      def clean_username(self):
          return self.cleaned_data['username'] or None
  
  @admin.register(GaeDatastoreUser)
  class UserAdmin(admin.ModelAdmin):
      exclude = ('password',)
      form = UserAdminForm
  
      def save_model(self, request, user, form, change):
          if not user.password:
              user.set_password(None)
              user.save()
  
  admin.site.register(Group)
  
new_contents: from django.contrib import admin
  from django import forms
  
  # DJANGAE
  from djangae.contrib.gauth.datastore.models import (
      GaeDatastoreUser,
      Group
  )
  
  class UserAdminForm(forms.ModelForm):
      username = forms.CharField(required=False)
  
      def clean_username(self):
          return self.cleaned_data['username'] or None
  
  @admin.register(GaeDatastoreUser)
  class UserAdmin(admin.ModelAdmin):
      exclude = ('password',)
      form = UserAdminForm
  
      def save_model(self, request, user, form, change):
          if not user.password:
              user.set_password(None)
          user.save()
  
  admin.site.register(Group)
  
subject: Revert "Small optimisation"