style: ux improvment by hidding scope filter or navigation in archive browsing depending of search

src/app/features/home/components/routables/home-search/home-search.routable.html

-<dlcm-home-search-filter *ngIf="isLoggedInObs | async"
+<dlcm-home-search-filter *ngIf="!(searchObs | async | isNullOrUndefined) && (searchObs | async | isNonEmptyString)"
                          [searchScope]="searchScopeObs | async"
                          (searchScopeChange)="searchScopeChange($event)"
 >
@@ -9,10 +9,14 @@
                       (valueChange)="search($event)"
                       [value]="searchObs | async"
   ></dlcm-shared-search>
-  <div class="or">
+  <div *ngIf="(searchObs | async | isNullOrUndefined) || !(searchObs | async | isNonEmptyString)"
+       class="or"
+  >
     {{'home.or' | translate}}
   </div>
-  <div class="button-wrapper">
+  <div *ngIf="(searchObs | async | isNullOrUndefined) || !(searchObs | async | isNonEmptyString)"
+       class="button-wrapper"
+  >
     <button mat-button
             color="primary"
             (click)="goToArchivalBrowsing()"