DSC-2194 Updated checks for the chart button

(cherry picked from commit 25f60c596cc7d3370424c71f2a184785001eb931)
(cherry picked from commit 7fd87b9)

Author: Mattia Vianelli

src/app/shared/search/search-charts/search-charts.component.html

@@ -7,7 +7,7 @@ <h2 class="m-0 text-break">{{'search.filters.applied.charts.' + ((configuration
         </div>
         <button class="btn btn-outline-secondary" data-test="search-charts-toggle"
                 ngbTooltip="{{'search.sidebar.show.hide.charts.tooltip' | translate}}"
-                (click)="toggleChart()" *ngIf="showChartsToggle">
+                (click)="toggleChart()" *ngIf="showChartsToggle && hasValidCharts">
           <i class="fa fa-chart-line mr-2"></i> {{"search.filters.applied.charts.show.hide" | translate}}</button>
       </div>
       <div *ngIf="!collapseChart && selectedFilter" @shrinkInOut data-test="search-charts">

src/app/shared/search/search-charts/search-charts.component.ts

@@ -69,6 +69,24 @@ export class SearchChartsComponent implements OnInit {
    */
   isPlatformBrowser: boolean;
 
+  /**
+   * Array with charts visibility
+   */
+  chartsVisibilityList$: Observable<boolean[]> = of([true]);
+
+  /**
+   *
+   * @param cdr
+   * @param searchService
+   * @param platformId
+   * @param searchConfigService
+   */
+
+  /**
+   * Prop that provides the boolean value for an existing valid chart (true if at least one valid chart is found)
+   */
+  hasValidCharts = false;
+
   constructor(
     private cdr: ChangeDetectorRef,
     private searchService: SearchService,
@@ -89,6 +107,7 @@ export class SearchChartsComponent implements OnInit {
               this.selectedFilter = this.selectedFilter
                 ? this.selectedFilter
                 : rd.hasSucceeded && hasValues ? rd.payload[0] : null;
+              this.hasValidCharts = hasValues;
               this.cdr.detectChanges();
             })
           );