UFAL/License agreement page component errors (#867)

* Design fix - added spaces between links

* Fix of firstMedataValue null properties

src/app/bitstream-page/clarin-license-agreement-page/clarin-license-agreement-page.component.html

@@ -25,7 +25,7 @@ <h2 id="header" class="border-bottom pb-2">{{'clarin.license.agreement.title' |
   <div class="row pt-3">
     <div class="col-12">
       <span>{{'clarin.license.agreement.signer.header.info.0' | translate}}</span>
-      <a [href]="'mailto:'+(helpDesk$ | async)?.payload?.values[0]">{{'clarin.license.agreement.signer.header.info.1' | translate}}</a>
+      <a class="ml-1 mr-1" [href]="'mailto:'+(helpDesk$ | async)?.payload?.values[0]">{{'clarin.license.agreement.signer.header.info.1' | translate}}</a>
       <span>{{'clarin.license.agreement.signer.header.info.2' | translate}}</span>
     </div>
   </div>

src/app/bitstream-page/clarin-license-agreement-page/clarin-license-agreement-page.component.ts

@@ -170,7 +170,7 @@ export class ClarinLicenseAgreementPageComponent implements OnInit {
    */
   loadLicenseContentSeznam() {
     this.item$.subscribe((item) => {
-      if (item.firstMetadataValue('dc.rights') === this.LICENSE_NAME_SEZNAM) {
+      if (item?.firstMetadataValue('dc.rights') === this.LICENSE_NAME_SEZNAM) {
         this.htmlContentService.getHmtlContentByPathAndLocale(this.LICENSE_PATH_SEZNAM_CZ).then(content => {
           this.licenseContentSeznam.next(content);
         });