Merge "Fail check-boot-jars if boot jar contains 0 .class files"

  if p.returncode != 0:

    return False

  items = stdout.split()

  classes = 0

  for f in items:

    if f.endswith('.class'):

      classes += 1

      package_name = os.path.dirname(f)

      package_name = package_name.replace('/', '.')

      if not package_name or not allow_list_re.match(package_name):

                              ' not in the allow list %s of packages allowed on the bootclasspath.'

                              % (jar, f, package_name, allow_list_path))

        return False

  if classes == 0:

    print >> sys.stderr, ('Error: %s does not contain any class files.' % jar)

    return False

  return True