création de l'interface admin temporaire

apps/food/models.py

@@ -211,6 +211,8 @@ class Transformed_food(models.Model):
     transformed_ingredient = models.ForeignKey(
         "self",
         on_delete = models.CASCADE,
+        blank = True,
+        null = True,
         related_name = '+',
         verbose_name = _('transformed ingredient'),
     )