[KNOWAGE-9687] fix alias not showing in xlsx export

Author: eng-dedalus

knowage-export/src/main/java/it/eng/knowage/engine/api/export/dashboard/DashboardExporter.java

@@ -398,7 +398,7 @@ protected JSONArray getDashboardTableOrderedColumns(JSONArray columnsNew, List<S
                 for (int j = 0; j < columnsOld.length(); j++) {
                     JSONObject columnOld = columnsOld.getJSONObject(j);
 
-                    if (columnOld.getString("header").equals(columnNew.getString("columnName"))) {
+                    if (columnOld.getString("header").equals(columnNew.optString("columnName"))  || columnOld.getString("header").equals(columnNew.optString("alias"))) {
                         columnOld.put("id", columnNew.getString("id"));
                         columnOld.put("alias", columnNew.getString("alias"));