优化 index-tree.vue.vm 文件，undefined 修改为 null

fungleo

2020-07-26 ca657b048275fbac4fd13e3c26808ad20e8ea128

 ruoyi-ui/src/layout/components/Sidebar/index.vue

@@ -13,8 +13,8 @@
                mode="vertical"

            >

                <sidebar-item

                    v-for="route in permission_routes"

                    :key="route.path"

                    v-for="(route, index) in permission_routes"

                    :key="route.path  + index"

                    :item="route"

                    :base-path="route.path"

                />