for container_name, container_content_type in contentreference_containers:
if ('contentreference_container_%s' % container_name) in form.cleaned_data:
content = form.cleaned_data[('contentreference_container_%s' % container_name)]
+ if content == None:
+ continue
contentreference, created = page.contentreferences.get_or_create(name=container_name, defaults={'content': content})
if not created:
contentreference.content = content