archive_timeout behavior for no activity

Looking at the archive_timeout documentation and CheckArchiveTimeout(),
it appears we force a new xlog file and archive it even if no activity
has been recorded in the xlog file.  Is this correct?  Should we
document this or fix it so only xlog files with contents are archived?

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +