Merge pull request #1333 in DESIGN/design from ~ZHENG/c-design:release/10.0 to release/10.0

* commit '5a3fe79d16b06a837ad657a47a036505ac545dfe':
  CHART-11634 bug退回：值标签没有位置 报npe

designer-chart/src/main/java/com/fr/van/chart/designer/style/label/VanChartPlotLabelDetailPane.java

@@ -157,6 +157,9 @@ public class VanChartPlotLabelDetailPane extends BasicPane {
     }
 
     private void checkPositionPane() {
+        if (positionPane == null) {
+            return;
+        }
         TwoTuple<String[], Integer[]> result = getPositionNamesAndValues();
         if (result == null) {
             return;