Merge pull request #1598 in DESIGN/design from ~HADES/design:release/10.0 to release/10.0

* commit '9c1defb11acd3a677c56677696b41f2d8af56f06':
  REPORT-29462 设计器菜单栏-模板-纸张背景-渐变色，滑动右边游标，确定后再次查看，位置回到初始位置
  REPORT-29882 8.0工程升级10.0后，模板web属性打不开

designer-base/src/main/java/com/fr/design/style/background/BackgroundPane.java

@@ -118,6 +118,9 @@ public class BackgroundPane extends BasicPane {
      */
     public void populate(Background background) {
         BackgroundUIWrapper wrapper = getBackgroundUIWrapper(background);
+        if (wrapper == null) {
+            return;
+        }
         int index = wrapper.getIndex();
         BackgroundDetailPane quickPane = getTabItemPane(background, index);
         quickPane.populate(background);

designer-base/src/main/java/com/fr/design/style/background/gradient/GradientBar.java

@@ -244,6 +244,7 @@ public class GradientBar extends JComponent implements UIObserver, ColorSelectab
      */
     public void setStartValue(double startValue) {
         startLabel.setValue(startValue);
+        p1.setX(startValue);
     }
 
     /**
@@ -251,6 +252,7 @@ public class GradientBar extends JComponent implements UIObserver, ColorSelectab
      */
     public void setEndValue(double endValue) {
         endLabel.setValue(endValue);
+        p2.setX(endValue);
     }
 
     /**