fix(badge): value of 0 is not rendered

Author: SisIvanova

projects/igniteui-angular/src/lib/badge/badge.component.html

@@ -1,4 +1,4 @@
-<span *ngIf="value && !icon" class="igx-badge__value">{{value}}</span>
+<span *ngIf="value || value === 0 && !icon" class="igx-badge__value">{{value}}</span>
 <igx-icon *ngIf="icon && !iconSet">{{icon}}</igx-icon>
 <igx-icon *ngIf="icon && iconSet" [family]="iconSet" [name]="icon">{{icon}}</igx-icon>
 <ng-content></ng-content>