when missing a command-line target, jcs:execute generates nasty output

[philshafer]

var $local = jcs:open();

match / {
{
var $getfilerpc = {
{
"/var/tmp/simon.txt";
"raw";
}
}
var $file = jcs:execute($local,$getfilerpc);
$file;
}
}

When missing a command-line target, this is not acceptable output:

[root@space-0050569b0064 LocalScript]# juise testrpc.slax
jcs:execute: null argument
xmlXPathCompiledEval: evaluation failed
runtime error: file testrpc.slax line 23 element variable
Failed to evaluate the expression of variable 'file'.

I'll make a better error message. It's probably best to
just return a node set with an error like:

xnm:error
connection is null; likely no target device was provided
/xnm:error

Thanks,
Phil