GTM Custom JavaScript - Error Handling. Used in a case where a custom js variable returns a value for a Custom Dimension. Used it for temporary troubleshooting.

customjs-error-handlig.js

function() {
   try {
    // Option1 or Option2
     cd = 'undefined' 
     if({{customVarOption1orOption2}} == 1){
      cd = '-'; //option1
     }
     else if({{customVarOption1orOption2}} == 2){
       cd = '-'; // option2
     }
   return cd;
   }catch(e) {
     return cd = e.message;
   }
}