title: Vuetify multiple v-select required rules don't work
body: <p><strong>Steps to reproduce:</strong></p>
  <p>If its multiple select required rules don't work if its not a multiple its ok.</p>
  <p><strong>Expected Behavior</strong></p>
  <p>rules to work for multiple select as well</p>
  <p><strong>Actual Behavior</strong></p>
  <p>rules don't work if its multiple select</p>
  <p>Reproduction code :</p>
  <pre><code> &lt;div id=&quot;app&quot;&gt;
       &lt;v-app id=&quot;inspire&quot;&gt;
        &lt;v-select
           :items=&quot;role&quot;
           label=&quot;Admin level*&quot;
           class=&quot;mt-3 &quot;
           @focus=&quot;reset&quot;
           item-text=&quot;name&quot;
           item-value=&quot;name&quot;
           v-model=&quot;roleee&quot;
           required
           :rules=&quot;rules.select&quot;
        &gt;&lt;/v-select&gt;
        &lt;v-select
           :items=&quot;subsidiaries&quot;
           label=&quot;Subsidiary*&quot;
           class=&quot;mt-3 &quot;
           @focus=&quot;reset&quot;
           item-text=&quot;name&quot;
           item-value=&quot;name&quot;            
           v-model=&quot;subsidiariesss&quot;
           multiple
           required
           :rules=&quot;rules.select&quot;
           :menu-props=&quot;{ bottom: true, offsetY: true }&quot;
         &gt;&lt;/v-select&gt;
        &lt;/v-app&gt;
       &lt;/div&gt;
       &lt;script&gt;
          new Vue({
          el: '#app',
          data: {
           role:[
            {name:'Admin', id:1},
            {name: 'SuperAdmin', id:2}
            ], 
            subsidiaries: [
             {name: &quot;ASdsad&quot;, id:1},
             {name: &quot;dsd&quot;, id:2},
             {name: &quot;34&quot;, id:3},
             {name: &quot;ASvxcdsad&quot;, id:4}
            ],
            rules: {
             select: [v =&gt; !!v || 'Item is required'] 
            }
            },
          methods: {
           reset() {
            this.$refs.form.resetValidation();
           },
          }
         })
        &lt;/script&gt;
  </code></pre>