Fixed Datasource determination for autocomplete patterns if datasource is empty

ui-ngx/src/app/modules/home/models/widget-component.models.ts

@@ -68,7 +68,7 @@ import {
   formatValue,
   getEntityDetailsPageURL,
   hasDatasourceLabelsVariables,
-  isDefined
+  isDefined, isDefinedAndNotNull
 } from '@core/utils';
 import { Store } from '@ngrx/store';
 import { AppState } from '@core/core.state';
@@ -555,7 +555,9 @@ export class LabelVariablePattern {
         const entityInfo = this.ctx.defaultSubscription.getFirstEntityInfo();
         label = createLabelFromSubscriptionEntityInfo(entityInfo, label);
       } else {
-        const datasource = this.ctx.defaultSubscription?.firstDatasource ?? (this.ctx as any).mapInstance?.getData()[0];
+        const datasource = isDefinedAndNotNull(this.ctx.defaultSubscription)
+          ? this.ctx.defaultSubscription.firstDatasource ?? undefined
+          : (this.ctx as any).mapInstance?.getData()[0];
         label = createLabelFromDatasource(datasource, label);
       }
     }