function _mdomain return bad domain

code in function _mdomain() will return bad domain, e.g. return "n" in my test environment.
it is cause by $cut will not be null, when there is no 'pluginins' in $path
$cut = strpos($path, '/plugins/') + 9;

and when no domain match, we should not return "". I think it should be "statusnet".

so the here in _mdomain() should be changed from:
$cut = strpos($path, '/plugins/') + 9;
$cut2 = strpos($path, '/', $cut);
if ($cut && $cut2) {
$cached[$path] = substr($path, $cut, $cut2 - $cut);
} else {
return null;
}
to:
if(strpos($path, '/plugins/')){
$cut = strpos($path, '/plugins/') + 9;
$cut2 = strpos($path, '/', $cut);
}
if ($cut && $cut2) {
$cached[$path] = substr($path, $cut, $cut2 - $cut);
} else {
return "statusnet";
}