应用切换判断方法是否存在

@VIEW/应用首页视图/VIEW-BASE.vue.ftl

@@ -48,7 +48,7 @@ export default class ${srfclassname('${view.name}')}Base extends IndexViewBase {
      * @type {boolean}
      * @memberof ${srfclassname('${view.name}')}Base
      */
-    public isEnableAppSwitch: boolean = <#if view.isEnableAppSwitch && view.isEnableAppSwitch()??>${view.isEnableAppSwitch()?c}<#else>false</#if>;
+    public isEnableAppSwitch: boolean = <#if view.isEnableAppSwitch?? && view.isEnableAppSwitch()??>${view.isEnableAppSwitch()?c}<#else>false</#if>;
 
     /**
      * 容器模型