fix: dont return early for required map (#206)

Author: UlrikSandberg

src/LEGO.AsyncAPI/Writers/AsyncApiWriterExtensions.cs

@@ -285,10 +285,7 @@ public static void WriteRequiredMap<T>(
             Action<IAsyncApiWriter, string, T> action)
             where T : IAsyncApiElement
         {
-            if (elements != null && elements.Any())
-            {
-                writer.WriteMapInternal(name, elements, action);
-            }
+            writer.WriteMapInternal(name, elements, action);
         }
 
         /// <summary>

test/LEGO.AsyncAPI.Tests/AsyncApiDocumentV2Tests.cs

@@ -1325,5 +1325,36 @@ public void Serializev2_WithBindings_Serializes()
 
             Assert.AreEqual("this mah binding", httpBinding.Headers.Description);
         }
+
+
+
+        [Test]
+        public void SerializeV2_EmptyChannelObject_DeserializeAndSerializePreserveChannelObject()
+        {
+            // Arrange
+            var spec = """
+            asyncapi: 2.6.0
+            info:
+              title: Spec with missing channel info
+              description: test description
+            servers:
+              production:
+                url: example.com
+                protocol: pulsar+ssl
+                description: test description
+            channels: { }
+            """;
+
+            var settings = new AsyncApiReaderSettings();
+            var reader = new AsyncApiStringReader(settings);
+
+            // Act
+            var deserialized = reader.Read(spec, out var diagnostic);
+            var actual = deserialized.Serialize(AsyncApiVersion.AsyncApi2_0, AsyncApiFormat.Yaml);
+
+            // Assert
+            actual.Should()
+                .BePlatformAgnosticEquivalentTo(spec);
+        }
     }
 }