Issue #2944101 by John Cook: Notices logged when viewing charts

modules/charts_highcharts/src/Charts/HighchartsChartsRender.php

@@ -150,20 +150,23 @@ class HighchartsChartsRender implements ChartsRenderInterface {
     $plotOptionsSeries = new PlotOptionsSeries();
     $plotOptionsSeriesDataLabels = new PlotOptionsSeriesDataLabels();
     // Set plot options if stacked chart.
-    if(!empty($options['grouping'])) {
+    if (!empty($options['grouping'])) {
       $plotOptions->setPlotSeries($plotOptionsStacking);
       $plotOptionsStacking->setDataLabels($plotOptionsSeriesDataLabels);
-      $plotOptionsSeriesDataLabels->setEnabled($options['data_labels']);
     }
     else {
       $plotOptions->setPlotSeries($plotOptionsSeries);
       $plotOptionsSeries->setDataLabels($plotOptionsSeriesDataLabels);
+    }
+    if (isset($options['data_labels'])) {
       $plotOptionsSeriesDataLabels->setEnabled($options['data_labels']);
     }
 
     // Set Tooltip.
     $chartTooltip = new Tooltip();
-    $chartTooltip->setEnabled($options['tooltips']);
+    if (isset($options['tooltips'])) {
+      $chartTooltip->setEnabled($options['tooltips']);
+    }
     $chartCredits = new ChartCredits();
 
     // Set charts legend.