Replace empty headers with misc. header names in PapaParse

sample.js

// References:
// https://stackoverflow.com/questions/35113926/change-csv-headers-while-processing-papaparse
// https://github.com/mholt/PapaParse/issues/196
// https://github.com/mholt/PapaParse/pull/192/files
// https://github.com/mholt/PapaParse/issues/413

    beforeFirstChunk: function(chunk) { // replace empty headers with misc. header names
      var rows = chunk.split( /\r\n|\r|\n/ );
      //console.log(rows[0]);
      var headings = rows[0]; //var headings = '"Item Number","Vend Reorder Number","Description","Item Category","Price-1","Last Cost","Account Code","Attribute-1","","Attribute-2","Attribute-3","Attribute-4","Attribute-5","Attribute-6","Category/Subcategory","Default cost of sale %","Eccomerce Item"," ","Item Type","Long Description","Price Desimal","Quantity Desimal","Regular Price","","Status","Subcategory","Primary Vendor"';
      var counter = 1;
      while (/,"\s*",/.exec(headings)) {
        headings = headings.replace( /,"\s*",/ , ',"misc'+counter+'",' );
        counter++;
      }
      rows[0] = headings;
      //console.log(rows[0]);
      return rows.join('\r\n');
      //return chunk;
    },