Add omitempty to samples for autogen (#15681)

Author: shuyama1

mmv1/api/resource.go

@@ -221,7 +221,7 @@ type Resource struct {
 	Examples []*resource.Examples
 
 	// Samples for generating tests and documentation
-	Samples []*resource.Sample
+	Samples []*resource.Sample `yaml:"samples,omitempty"`
 
 	// If true, generates product operation handling logic.
 	AutogenAsync bool `yaml:"autogen_async,omitempty"`