Add managed reporter output state

identity.go

@@ -27,6 +27,16 @@ type Streams struct {
 	Err io.Writer
 }
 
+func normalizeStreams(streams Streams) Streams {
+	if streams.Out == nil {
+		streams.Out = io.Discard
+	}
+	if streams.Err == nil {
+		streams.Err = io.Discard
+	}
+	return streams
+}
+
 // Invocation provides execution context and output streams to a command
 // handler. For command aliases, EnteredPath and CanonicalPath expose the route
 // the caller used and the selected canonical command path. Both omit the