Improve the demo feature of the project

services/inventory/app/schemas/inventory.py

@@ -128,12 +128,24 @@ class IngredientResponse(InventoryBaseSchema):
     created_at: datetime
     updated_at: datetime
     created_by: Optional[str]
-    
+
     # Computed fields
     current_stock: Optional[float] = None
     is_low_stock: Optional[bool] = None
     needs_reorder: Optional[bool] = None
 
+    @validator('allergen_info', pre=True)
+    def validate_allergen_info(cls, v):
+        """Convert empty lists or lists to empty dict, handle None"""
+        if v is None:
+            return None
+        if isinstance(v, list):
+            # If it's an empty list or a list, convert to empty dict
+            return {} if len(v) == 0 else None
+        if isinstance(v, dict):
+            return v
+        return None
+
 
 # ===== STOCK SCHEMAS =====