You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: face.go
    path of file: ./repos/photoprism/internal/face
    
    the code of the file until where you have to start completion: /*
Package face provides face recognition.

Copyright (c) 2018 - 2024 PhotoPrism UG. All rights reserved.

	This program is free software: you can 
    
func (f *Face) RelativeLandmarksJSON() (b []byte) {
	var noResult = []byte("")

	l := f.RelativeLandmarks()

	if len(l) < 1 {
		return noResult
	}

	if result, err := json.Marshal(l); err != nil {
		log.Errorf("faces: %s", err)
		return noResult
	} else {
		return result
	}
}