Adding if to validate if user send or no the list of columns

Author: dlascarez

src/angular-datatables.directive.ts

@@ -77,11 +77,13 @@ export class DataTableDirective implements OnDestroy, OnInit {
  }
 
  // Set a column unique
- resolvedDTOptions.columns.forEach(col => {
- if ((col.id ?? '').trim() === '') {
- col.id = this.getColumnUniqueId();
- }
- });
+ if (resolvedDTOptions.columns) {
+ resolvedDTOptions.columns.forEach(col => {
+ if ((col.id ?? '').trim() === '') {
+ col.id = this.getColumnUniqueId();
+ }
+ });
+ }
 
  // Using setTimeout as a "hack" to be "part" of NgZone
  setTimeout(() => {