Change not found item to return 404 not 500

inventory-app/inventory.py

@@ -34,6 +34,8 @@ def view_inventory_view(item_id):
     user = read_user()
     template = "inventory_view.html"
     item = db.inventory.find_one({ "_id": ObjectId(item_id) })
+    if not item:
+        return abort(404)
     item_user = item.get("inventory", {}).get("user", {}).get("username", None)
     if not user:
         if not item["inventory"].get("public"):