UI: refactored check for value card widget

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

@@ -27,7 +27,7 @@ import {
   ViewChild
 } from '@angular/core';
 import { WidgetContext } from '@home/models/widget-component.models';
-import { formatValue, isDefinedAndNotNull, isNotEmptyStr, isString } from '@core/utils';
+import { formatValue, isDefinedAndNotNull } from '@core/utils';
 import {
   backgroundStyle,
   ColorProcessor,
@@ -183,10 +183,7 @@ export class ValueCardWidgetComponent implements OnInit, AfterViewInit, OnDestro
     const tsValue = getSingleTsValue(this.ctx.data);
     let ts;
     let value;
-    if (
-      tsValue && isDefinedAndNotNull(tsValue[1]) &&
-      (!isString(tsValue[1]) || isNotEmptyStr(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);