message: fix: don't show contact if it is empty object
diff: </p>
  <p>
  <!-- TODO: create separate components for contact and license ? -->
  - <span *ngIf="info?.contact"> Contact:
  + <span *ngIf="info?.contact?.url || info?.contact?.email"> Contact:
  <a *ngIf="info.contact.url" href="{{info.contact.url}}">
  {{info.contact.name || info.contact.url}}</a>
  <a *ngIf="info.contact.email" href="mailto:{{info.contact.email}}">
  