Pull request #2380: REPORT-40094 【回归】远程切换回本地，网页框控件不显示

Merge in DESIGN/design from ~HADES/design:release/10.0 to release/10.0

* commit '2bac14ada6b3eaf947adfb4b78489fd18c1cf2e6':
  REPORT-40094 【回归】远程切换回本地，网页框控件不显示

designer-base/src/main/java/com/fr/design/mainframe/EastRegionContainerPane.java

@@ -511,7 +511,10 @@ public class EastRegionContainerPane extends UIEastResizableContainer {
         UIUtil.invokeLaterIfNeeded(new Runnable() {
             @Override
             public void run() {
-                propertyItemMap.get(key).replaceContentPane(pane);
+                PropertyItem item = propertyItemMap.get(key);
+                if (item != null) {
+                    item.replaceContentPane(pane);
+                }
             }
         });
     }