null check

Author: levimatheri

src/Bicep.Core/TypeSystem/Providers/Extensibility/ExtensionResourceTypeLoader.cs

@@ -32,8 +32,8 @@ public ExtensionResourceTypeLoader(ITypeLoader typeLoader, TypeIndex? typeIndex
             this.availableTypes = typeIndex.Resources.ToImmutableDictionary(x => ResourceTypeReference.Parse(x.Key), x => x.Value);
             this.typeSettings = typeIndex.Settings;
             this.fallbackResourceType = typeIndex.FallbackResourceType;
-            // already published types may not have namespace function property
-            this.namespaceFunctions = typeIndex.NamespaceFunctions is null ? [] : [..typeIndex.NamespaceFunctions];
+            
+            this.namespaceFunctions = typeIndex.NamespaceFunctions is { } nsFuncs ? [..nsFuncs] : []; // already published types may not have namespace function property
         }
 
         public IEnumerable<ResourceTypeReference> GetAvailableTypes()