增加空判断

designer-chart/src/main/java/com/fr/van/chart/column/VanChartColumnPlotLabelDetailPane.java

@@ -32,6 +32,10 @@ public class VanChartColumnPlotLabelDetailPane extends VanChartPlotLabelDetailPa
         UIButtonGroup<Integer> content = dataLabelContentPane.getContent();
         UIButtonGroup<Integer> orientation = getOrientation();
 
+        if (content == null || orientation == null) {
+            return;
+        }
+
         if (content.getSelectedIndex() == VanChartTooltipContentPane.RICH_EDITOR_INDEX) {
             orientation.setSelectedIndex(HORIZONTAL_INDEX);
             orientation.setEnabled(false);