修改判断对象是否存在bug

src/views/layout/sidebar.vue

  import API from '@/api'
  import { mapMutations } from 'vuex'
  import { getRouteNameByUrl } from '@/utils'
  import isEmpty from 'lodash/isEmpty'
  import isNil from 'lodash/isNil'
  export default {
    data () {
      return {
        if (/^\/n\/.*$/.test(route.path)) {
          var tab = this.$store.state.contentTabs.filter(item => item.name === route.name)[0]
          // tab不存在, 先添加
          if (isEmpty(tab)) {
          if (isNil(tab)) {
            var menuNav = this.getMenuNavByRouteName(route.name, this.$store.state.menuNavList)
            if (!isEmpty(menuNav)) {
            if (!isNil(menuNav)) {
              tab = {
                id: menuNav.menuId,
                name: route.name,