Prevent error when a credit doesn't have a link

src/app/editorialisation/components/credits/credits.component.html

@@ -11,7 +11,7 @@
       <div class="credit">
 
         <div class="logo-content">
-          <a [href]="credit.links[0].url" target="_blank" *ngIf="credit.links[0]; else withoutLink">
+          <a [href]="credit.links[0].url" target="_blank" *ngIf="credit.links && credit.links[0]; else withoutLink">
             <img [src]="credit.logo" [alt]="credit.name">
           </a>
           <ng-template #withoutLink>
@@ -22,7 +22,8 @@
         <p>{{credit.description}}</p>
 
         <div class="bottom-section">
-          <a [href]="credit.links[0].url" i18n="@@credits.visitWebsite">Visit the website</a>
+          <a *ngIf="credit.links && credit.links[0]" [href]="credit.links[0].url" i18n="@@credits.visitWebsite">Visit
+            the website</a>
         </div>
       </div>
     </div>

src/app/editorialisation/components/credits/credits.component.ts

 import { Component, OnInit } from '@angular/core';
-import { OrganizationsService } from '../../services/organizations.service';
-import { Organization, Credit } from '../../models';
-import { ElasticsearchService, DatasetResearchService } from '../../../geosource/services';
-import { Router } from '@angular/router';
+import { Credit } from '../../models';
 import { AppRoutes } from '../../../routes';
-import { Aggregation } from '../../../geosource/models/filter.model';
-import { scopesResearch } from '../../../geosource/models/scopes-research';
 import { IPageHeaderInfo } from '../../../shared/models';
 import { pageTitles, notificationMessages } from '../../../../i18n/traductions';
 import { NotificationService } from '../../../core/services';