More work on nullable reference types

src/Umbraco.Core/Models/ContentEditing/ContentItemBasic.cs

@@ -40,7 +40,7 @@ namespace Umbraco.Cms.Core.Models.ContentEditing
 
         [DataMember(Name = "contentTypeAlias", IsRequired = true)]
         [Required(AllowEmptyStrings = false)]
-        public string? ContentTypeAlias { get; set; }
+        public string ContentTypeAlias { get; set; } = null!;
 
         [DataMember(Name = "sortOrder")]
         public int SortOrder { get; set; }

src/Umbraco.Core/Models/ContentEditing/ContentItemDisplay.cs

@@ -136,7 +136,7 @@ namespace Umbraco.Cms.Core.Models.ContentEditing
         public int TemplateId { get; set; }
 
         [DataMember(Name = "allowedTemplates")]
-        public IDictionary<string, string>? AllowedTemplates { get; set; }
+        public IDictionary<string, string?>? AllowedTemplates { get; set; }
 
         [DataMember(Name = "documentType")]
         public ContentTypeBasic? DocumentType { get; set; }

src/Umbraco.Core/Models/ContentEditing/ContentItemSave.cs

@@ -30,7 +30,7 @@ namespace Umbraco.Cms.Core.Models.ContentEditing
 
         [DataMember(Name = "contentTypeAlias", IsRequired = true)]
         [Required(AllowEmptyStrings = false)]
-        public string? ContentTypeAlias { get; set; }
+        public string ContentTypeAlias { get; set; } = null!;
 
         /// <summary>
         /// The template alias to save

src/Umbraco.Core/Models/IconModel.cs

@@ -2,7 +2,7 @@ namespace Umbraco.Cms.Core.Models
 {
     public class IconModel
     {
-        public string? Name { get; set; }
-        public string? SvgString { get; set; }
+        public string Name { get; set; } = null!;
+        public string SvgString { get; set; } = null!;
     }
 }