How to return an empty value?

Question

Django

Model

def get_profile_cover_picture(self):
  default_cover = None
    if self.cover:
      return self.cover.url
    else:
      return default_cover

Serializers

def get_profile_cover_picture(self, obj):
  request = self.context.get('request')
  profile_cover_picture_url = obj.get_profile_cover_picture()
  return request.build_absolute_uri(profile_cover_picture_url)

Now
"profile_cover_picture" is returned: " localhost:8000/api/users/base_user_profile/admin "
I need that if cover is missing, then the string should be empty

Answer 1

def get_profile_cover_picture(self, obj):
    return obj.get_profile_cover_picture()