class Edito(models.Model):
title = models.CharField(max_length=50)
cover_picture = models.ImageField(upload_to=edito_picture_upload_path, blank=True, null=True)
picture = CloudinaryField('image', blank=True, null=True)
editos = Edito.objects.all()
for edito in editos:
if edito.picture is None:
edito.picture = edito.cover_picture # I know it doesn't work !
edito.save()