patched ScriptHelpers::ftp_file() to return ftp->message() only if put command failed, not as method return value, as message() gets replaced by output of quit(); patched ppm_and_results.pl to set unknown referrer value to empty}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1374 4177bd82-f056-0410-812d-caef170e3fa0