REPORT-2381 客户bug历史遗留问题，空指针引发控件属性面板生成失败最终导致报表切换失败

designer_form/src/com/fr/design/mainframe/WidgetPropertyPane.java

@@ -259,8 +259,11 @@ public class WidgetPropertyPane extends FormDockView implements BaseWidgetProper
             xCreator = designer.getRootComponent();
         }
         XLayoutContainer container = XCreatorUtils.getHotspotContainer(xCreator);
-        //TODO container可能为空，引发空指针异常
-        return xCreator.acceptType(XWParameterLayout.class) || container.acceptType(XWParameterLayout.class);
+
+        boolean xCreatorAccept = xCreator.acceptType(XWParameterLayout.class);
+        boolean containerAccept = container!=null && container.acceptType(XWParameterLayout.class);
+
+        return xCreatorAccept || containerAccept;
     }
 
     public void setEditingFormDesigner(BaseFormDesigner editor) {