message: docs: add missing v-if
diff: @before-enter="flushWaiter"
  @before-leave="setupWaiter"
  > -->
  - <component :is="Component" v-bind="props" />
  + <component v-if="Component" :is="Component" v-bind="props" />
  <!-- </transition> -->
  </router-view>
  </template>
  