fix: correctly set value for the ListElement on load

[mpopelo]

🔗 Linked issue

❓ Type of change

• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Currently, in the ListElement component, when data is loaded using the load() method, the value property is incorrectly set to [undefined, undefined, ...]. This pull request addresses this issue by ensuring that the ListElement correctly initializes the value property with the appropriate values.

📝 Checklist

• I have linked an issue or discussion.

[adamberecz]

Thanks for the PR. Right now I can see that list items are added upon load with undefined values and a tick later the values are loaded. Could you please give me an example when this becomes an issue? It would help me to understand if the change is required, because it affect other things (tests break).

[adamberecz]

Closing this due to inactivity.