update：更新

@CONTROL/面板/CONTROL-BASE.vue.ftl

@@ -107,7 +107,7 @@ import UIService from '@/uiservice/ui-service';
     <#assign item=ctrl />
     <@getLayoutItemModel panelItems type view item/>
 
-    <#assign rootPanelItems=null />
+    <#assign rootPanelItems='' />
     <#if ctrl.getRootPSPanelItems?? && ctrl.getRootPSPanelItems()??>
     <#assign rootPanelItems=ctrl.getRootPSPanelItems() />
     </#if>