Delete error msg rows on modal close

Author: ivansg44

lib/DataHarmonizer.js

@@ -162,6 +162,7 @@ class DataHarmonizer {
 
     // Reset specify header modal values when the modal is closed
     $('#specify-headers-modal').on('hidden.bs.modal', () => {
+      $('.mapping-row').remove();
       $('#specify-headers-err-msg').hide();
       $('#specify-headers-confirm-btn').unbind();
     });
@@ -1355,9 +1356,9 @@ class DataHarmonizer {
         const rowCells = expectedHeaderCell + actualHeaderCell;
         let row;
         if (expectedHeader !== matrix[1][i]) {
-          row = $(`<tr class="table-warning">${rowCells}</tr>`);
+          row = $(`<tr class="table-warning mapping-row">${rowCells}</tr>`);
         } else {
-          row = $(`<tr>${rowCells}</tr>`);
+          row = $(`<tr class="mapping-row">${rowCells}</tr>`);
         }
         $fieldMappingBody.append(row);
       });