Fix wrong number of digits after floating point in legend

ui-ngx/src/app/core/api/widget-subscription.ts

@@ -47,7 +47,7 @@ import {
 import { forkJoin, Observable, of, ReplaySubject, Subject, throwError } from 'rxjs';
 import { CancelAnimationFrame } from '@core/services/raf.service';
 import { EntityType } from '@shared/models/entity-type.models';
-import { createLabelFromDatasource, deepClone, isDefined, isEqual } from '@core/utils';
+import { createLabelFromDatasource, deepClone, isDefined, isDefinedAndNotNull, isEqual } from '@core/utils';
 import { EntityId } from '@app/shared/models/id/entity-id';
 import * as moment_ from 'moment';
 import { emptyPageData, PageData } from '@shared/models/page/page-data';
@@ -1332,7 +1332,7 @@ export class WidgetSubscription implements IWidgetSubscription {
 
   private updateLegend(dataIndex: number, data: DataSet, detectChanges: boolean) {
     const dataKey = this.legendData.keys.find(key => key.dataIndex === dataIndex).dataKey;
-    const decimals = isDefined(dataKey.decimals) ? dataKey.decimals : this.decimals;
+    const decimals = isDefinedAndNotNull(dataKey.decimals) ? dataKey.decimals : this.decimals;
     const units = dataKey.units && dataKey.units.length ? dataKey.units : this.units;
     const legendKeyData = this.legendData.data[dataIndex];
     if (this.legendConfig.showMin) {

ui-ngx/src/app/modules/home/components/widget/lib/flot-widget.ts

@@ -380,7 +380,7 @@ export class TbFlot {
     const yaxesMap: {[units: string]: TbFlotAxisOptions} = {};
     const predefinedThresholds: TbFlotThresholdMarking[] = [];
     const thresholdsDatasources: Datasource[] = [];
-    if (this.settings.customLegendEnabled) {
+    if (this.settings.customLegendEnabled && this.settings.dataKeysListForLabels?.length) {
       this.labelPatternsSourcesData = [];
       const labelPatternsDatasources: Datasource[] = [];
       this.settings.dataKeysListForLabels.forEach((item) => {