Always have a default, and always check before trying to use that the selector responds with something

always-have-a-default-first.js

// you can do this
$('.class-to-find').each(function(index){
  outputValue = $(this).text();
});
// but it will fail badly if there is nothing found by $('class-to-find').

//better to do
outputValue = '';  // set a default value
if($('.class-to-find').length){ // make sure that there is something to loop
  $('.class-to-find').each(function(index){ // do the loop
    outputValue = $(this).text();// append the text
  });
}