Skip generating MSDI file if no handlers

src/Immediate.Handlers.Generators/ImmediateHandlersGenerator.cs

@@ -85,6 +85,9 @@ private static void RenderServiceCollectionExtension(
 		if (!hasDi)
 			return;
 
+		if (!handlers.Any())
+			return;
+
 		if (handlers.Any(h => h.displayName is null || (h.behaviors?.Any(b => b is null) ?? false)))
 			return;
 

tests/Immediate.Handlers.Tests/GeneratorTests/HandlerTests.cs

@@ -271,4 +271,25 @@ private static ValueTask<int> HandleAsync(
 		_ = await Verify(result)
 			.UseParameters(string.Join("_", assemblies));
 	}
+
+	[Test]
+	[Arguments(DriverReferenceAssemblies.Msdi)]
+	public async Task NoHandlersGeneratesZeroFiles(DriverReferenceAssemblies assemblies)
+	{
+		var result = GeneratorTestHelper.RunGenerator(
+			"""
+			namespace Dummy;
+
+			public sealed class Test;
+			""",
+			assemblies
+		);
+
+		Assert.Empty(
+			result.GeneratedTrees
+		);
+
+		_ = await Verify(result)
+			.UseParameters(string.Join("_", assemblies));
+	}
 }