Loop & Merge with empty custom fields

Add a display logic to the choice to display only if the field is not empty.

Everything I try this, I can’t find the option for the field being empty. Where is that option?

share a screenshot of the options you are seeing and what you are doing.

Here is what the fields in the Loop & Merge look like:

Then when going through the loop, the first three are fine, but the fourth one looks like:

Unfortunately, Qualtrics doesn’t let you add display logic based on loop & merge fields. 

I would hide the choices with JavaScript:

Qualtrics.SurveyEngine.addOnload(function() {
  var fields = ["${lm://Field/2}","${lm://Field/3}","${lm://Field/4}","${lm://Field/5}"];
  jQuery("#"+this.questionId+" .Selection").each(function(i) {
    if(fields[i].length==0) jQuery(this).hide();
  });
});