Use ThrowIfNullOrEmpty in Resource ctor to reject empty names

Author: JamesNK

src/Aspire.Hosting.Azure.WebPubSub/AzureWebPubSubExtensions.cs

@@ -185,9 +185,9 @@ public static IResourceBuilder<AzureWebPubSubHubResource> AddHub(this IResourceB
         {
             hubResource = new AzureWebPubSubHubResource(name, hubName, builder.Resource);
             builder.Resource.Hubs[hubName] = hubResource;
+            return builder.ApplicationBuilder.AddResource(hubResource);
         }
-        var hubBuilder = builder.ApplicationBuilder.CreateResourceBuilder(hubResource);
-        return hubBuilder;
+        return builder.ApplicationBuilder.CreateResourceBuilder(hubResource);
     }
 
     /// <summary>

src/Aspire.Hosting/ApplicationModel/Resource.cs

@@ -27,7 +27,7 @@ public abstract class Resource : IResource
     /// <param name="name">The name of the resource.</param>
     protected Resource(string name)
     {
-        ArgumentNullException.ThrowIfNull(name);
+        ArgumentException.ThrowIfNullOrEmpty(name);
 
         Name = name;
     }