如何有条件地向路由中添加查询参数Vue.js?

Vue.use(VueRouter);

new Vue({
  el: '#app',
  router: new VueRouter({
    mode: 'history',
  }),
  computed: {
  	currentRoute () {
    	return this.$route.fullPath
    }
  },
  data () {
  	return {
    	some: this.$route.query.some || null      
    }
  },
  template: '<div><select v-model="some"><option :value="null">Option (value = null) which leaves empty parameter in URL</option><option value="someParameter">Option (value = someParameter) which shows parameter with value in URL</option><option :value="[]">Option (value = []) which removes parameter from URL</option></select><br><button @click="redirect">Click me</button><br><br><div>Current Path: {{ currentRoute }}</div></div>',
  methods: {
  	redirect () {
    	this.$router.push({
        path: '/search',
        query: {
          some: this.some || null
        }
      })
    }
  },
  watch: {
    '$route.query': {
      handler(query) {
      	this.some = this.$route.query.hasOwnProperty('some') ? this.$route.query.some : null
      },
    },
  },
  watchQuery: ['some']
});

<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<script src="https://unpkg.com/vue-router/dist/vue-router.js"></script>


<div id="app"></div>