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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def touch_empty_backreferences(app, what, name, obj, options, lines):
 """Generate empty back-reference example files This avoids inclusion errors/warnings if there are no gallery examples for a class / module that is being parsed by autodoc"""


    if not bool(app.config.sphinx_gallery_conf['backreferences_dir']):
        return

    examples_path = os.path.join(app.srcdir,
                                 app.config.sphinx_gallery_conf[
                                     "backreferences_dir"],
                                 "%s.examples" % name)

    if not os.path.exists(examples_path):
        # touch file
        open(examples_path, 'w').close()