So its possible to use Javascript to Try reading a file, and determine if the file is available (exists and is readable as text) by checking for an error.

Here is a quick script that will tell you if a Text file exist, and if its Empty or Not.
=========================================

function main() {

var state; // State or 0 = good txt, 1 = Empty, 2 = Read Error
var txt;
try { 
txt = read(arguments[0]);
state = 0;
}
catch(err) {
// ERROR: unreadable file, or file doesn't exist
txt = err.message;
state = 2;
}

if (txt == ""){
// text file exists but is empty
state = 1;
}

return [txt,state];

}

=========================================

@Michel how do we format code again.. its pretty script still installed?