Yes. Since Sails is created with Node.js you can use fs.exists.
This will remove the file from the array if it's not found. You can load it into your view how you were before.
fs = require('fs');
for (i = 0; i < loadJS.length; i++) {
fs.exists(loadJS[i], function(exists){
if(!exists){
//remove from array
loadJS.splice(i, 1);
}
});
}