[Xenon]

open private.php
find:

PHP Code:

if ($message=="" or $touser=="" or $title=="") {
    eval("standarderror(\"".gettemplate("error_requiredfields")."\");");
    exit;
  } 


replace with

PHP Code:

if (trim($message)=="" or $touser=="" or trim($title)=="") {
    eval("standarderror(\"".gettemplate("error_requiredfields")."\");");
    exit;
  } 


then no " " messages could be sent anymore