Return no metrics immediately if chartData.datasets are missing (#2082)

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

src/renderer/components/chart/bar-chart.tsx

@@ -50,6 +50,10 @@ export class BarChart extends React.Component<Props> {
         })
     };
 
+    if (chartData.datasets.length == 0) {
+      return <NoMetrics/>;
+    }
+
     const formatTimeLabels = (timestamp: string, index: number) => {
       const label = moment(parseInt(timestamp)).format("HH:mm");
       const offset = "     ";
@@ -143,10 +147,6 @@ export class BarChart extends React.Component<Props> {
     };
     const options = merge(barOptions, customOptions);
 
-    if (chartData.datasets.length == 0) {
-      return <NoMetrics/>;
-    }
-
     return (
       <Chart
         className={cssNames("BarChart flex box grow column", className)}