From c2047d1d6ec8729f454b57f80d0baa46ad14c32b Mon Sep 17 00:00:00 2001
From: Nikolai Emil Damm <nikolaiemildamm@icloud.com>
Date: Thu, 10 Nov 2022 14:13:10 +0100
Subject: [PATCH] Remove nullability from AdditionalData on ContentItemDisplay
 (#13380)

@Zeegaan We have a use case where we need to set a value in the AdditionalData dictionary in a NotificationHandler, but as it can be null, it requires reflection to make sure that is not the case. As such, it would be nice if the following change could be implemented to ensure it is never null.
---
 src/Umbraco.Core/Models/ContentEditing/ContentItemDisplay.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Umbraco.Core/Models/ContentEditing/ContentItemDisplay.cs b/src/Umbraco.Core/Models/ContentEditing/ContentItemDisplay.cs
index eb800791a2..d1a8d10970 100644
--- a/src/Umbraco.Core/Models/ContentEditing/ContentItemDisplay.cs
+++ b/src/Umbraco.Core/Models/ContentEditing/ContentItemDisplay.cs
@@ -201,7 +201,7 @@ public class ContentItemDisplay<TVariant> :
     /// </summary>
     [DataMember(Name = "metaData")]
     [ReadOnly(true)]
-    public IDictionary<string, object>? AdditionalData { get; private set; }
+    public IDictionary<string, object> AdditionalData { get; private set; } = new Dictionary<string, object>();
 
     /// <summary>
     ///     This is used for validation of a content item.