Merge pull request #9795 from Dmitriymush/bug-fix/value-card-widget

Added additional check for string and empty string in value card widget.

ui-ngx/src/app/modules/home/components/widget/lib/cards/value-card-widget.component.ts

@@ -183,7 +183,7 @@ export class ValueCardWidgetComponent implements OnInit, AfterViewInit, OnDestro
     const tsValue = getSingleTsValue(this.ctx.data);
     let ts;
     let value;
-    if (tsValue && isDefinedAndNotNull(tsValue[1])) {
+    if (tsValue && isDefinedAndNotNull(tsValue[1]) && tsValue[0] !== 0) {
       ts = tsValue[0];
       value = tsValue[1];
       this.valueText = formatValue(value, this.decimals, this.units, false);