fixed issue with singlestat and repeated scopedVars, was only working for time…

fixed issue with singlestat and repeated scopedVars, was only working for time series data sources, and only if there was any series, now scoped vars is always set, fixes #14367

public/app/plugins/panel/singlestat/module.ts

@@ -107,7 +107,10 @@ class SingleStatCtrl extends MetricsPanelCtrl {
   }
 
   onDataReceived(dataList) {
-    const data: any = {};
+    const data: any = {
+      scopedVars: _.extend({}, this.panel.scopedVars),
+    };
+
     if (dataList.length > 0 && dataList[0].type === 'table') {
       this.dataType = 'table';
       const tableData = dataList.map(this.tableHandler.bind(this));
@@ -117,6 +120,7 @@ class SingleStatCtrl extends MetricsPanelCtrl {
       this.series = dataList.map(this.seriesHandler.bind(this));
       this.setValues(data);
     }
+
     this.data = data;
     this.render();
   }
@@ -320,7 +324,6 @@ class SingleStatCtrl extends MetricsPanelCtrl {
       }
 
       // Add $__name variable for using in prefix or postfix
-      data.scopedVars = _.extend({}, this.panel.scopedVars);
       data.scopedVars['__name'] = { value: this.series[0].label };
     }
     this.setValueMapping(data);