Fix cases where the schemas will not be componetized because the x-schema-id is null or empty

Author: desjoerd

src/OpenApi/src/Extensions/JsonNodeSchemaExtensions.cs

@@ -455,7 +455,10 @@ internal static bool WillBeComponentized(this JsonNode schema, [NotNullWhen(true
             && schemaIdNode.GetValueKind() == JsonValueKind.String)
         {
             schemaId = schemaIdNode.GetValue<string>();
-            return true;
+            if (!string.IsNullOrEmpty(schemaId))
+            {
+                return true;
+            }
         }
         schemaId = null;
         return false;

src/OpenApi/src/Extensions/OpenApiSchemaExtensions.cs

@@ -28,7 +28,8 @@ public static bool IsComponentizedSchema(this OpenApiSchema schema, out string s
     {
         if(schema.Metadata is not null
             && schema.Metadata.TryGetValue(OpenApiConstants.SchemaId, out var schemaIdAsObject)
-            && schemaIdAsObject is string schemaIdString)
+            && schemaIdAsObject is string schemaIdString
+            && !string.IsNullOrEmpty(schemaIdString))
         {
             schemaId = schemaIdString;
             return true;