NullReferenceException in RestaurantDetails.LoadReviews()

[render93]

Bug Description

A NullReferenceException occurs in production when a user visits the details page of a restaurant that has no reviews.

Environment

• Environment: prod
• Date: 2025-12-03
• Time: 12:40:26 CET
• Service: DevEats.Web

Error Details

Field	Value
Exception Type	System.NullReferenceException
Message	Object reference not set to an instance of an object
Trace ID	638003fc95071eeb72d35158ec670a07

Stack Trace

System.NullReferenceException: Object reference not set to an instance of an object.
   at DevEats.Web.Pages.RestaurantDetails.LoadReviews() 
      in /home/runner/work/deveats/deveats/src/DevEats.Web/Pages/RestaurantDetails.razor:line 959
   at DevEats.Web.Pages.RestaurantDetails.LoadData() 
      in /home/runner/work/deveats/deveats/src/DevEats.Web/Pages/RestaurantDetails.razor:line 945
   at DevEats.Web.Pages.RestaurantDetails.OnInitializedAsync() 
      in /home/runner/work/deveats/deveats/src/DevEats.Web/Pages/RestaurantDetails.razor:line 927

Root Cause

The LoadReviews() method in RestaurantDetails.razor contained deliberate buggy code that was intended for Grafana testing but was deployed to production:

// DELIBERATE BUG FOR GRAFANA TESTING: Null reference when no reviews
if (!reviews.Any())
{
    Review? nullReview = null;
    var buggyAccess = nullReview.Comment; // This will throw NullReferenceException
}

When a restaurant has no reviews (e.g., Restaurant ID 10), this code attempts to access a property on a null object.

Steps to Reproduce

1. Navigate to a restaurant detail page
2. Select a restaurant that has no reviews (e.g., restaurant ID 10)
3. The page crashes with NullReferenceException

Fix Applied

Removed the deliberate bug code from LoadReviews() method in src/DevEats.Web/Pages/RestaurantDetails.razor.