Small updates

Author: localden

src/ModelContextProtocol.AspNetCore/Authentication/McpAuthenticationOptions.cs

@@ -83,8 +83,7 @@ public Func<HttpContext, ProtectedResourceMetadata>? ProtectedResourceMetadataPr
     {
         get => _resourceMetadataProvider;
         set => _resourceMetadataProvider = value;
-    }    
-    
+    }
 
     /// <summary>
     /// Gets the resource metadata for the current request.

src/ModelContextProtocol.Core/Authentication/AuthorizationHelpers.cs

@@ -144,11 +144,8 @@ internal async Task<ProtectedResourceMetadata> ExtractProtectedResourceMetadata(
         }
 
         Uri metadataUri = new(resourceMetadataUrl);        
-        var metadata = await FetchProtectedResourceMetadataAsync(metadataUri, cancellationToken).ConfigureAwait(false);
-        if (metadata == null)
-        {
-            throw new InvalidOperationException($"Failed to fetch resource metadata from {resourceMetadataUrl}");
-        }
+        var metadata = await FetchProtectedResourceMetadataAsync(metadataUri, cancellationToken).ConfigureAwait(false)
+            ?? throw new InvalidOperationException($"Failed to fetch resource metadata from {resourceMetadataUrl}");
 
         // Per RFC: The resource value must be identical to the URL that the client used
         // to make the request to the resource server