title: when i close the form dialog and reopen,the form is still red and isn’t initialized。
body: <p>i write a form like this with vuetify.</p>
  <pre><code>   &lt;v-form&gt;
            &lt;v-text-field
              autocomplete=&quot;off&quot;
              v-model=&quot;model.password&quot;
              :label=&quot;formschema.password.label&quot;
              :rules=&quot;[rules.required, rules.min]&quot;
              :append-icon=&quot;formschema.password.show ? 'mdi-eye' : 'mdi-eye-off'&quot;
              @click:append=&quot;formschema.password.show = !formschema.password.show&quot;
              :type=&quot;formschema.password.show ? 'text' : 'password'&quot;
              required
            &gt;&lt;/v-text-field&gt;
            &lt;v-text-field
              autocomplete=&quot;off&quot;
              v-model=&quot;model.newpassword&quot;
              :label=&quot;formschema.newpassword.label&quot;
              :rules=&quot;[rules.required, rules.min]&quot;
              :type=&quot;formschema.newpassword.show ? 'text' : 'password'&quot;
              :append-icon=&quot;
                formschema.newpassword.show ? 'mdi-eye' : 'mdi-eye-off'
              &quot;
              @click:append=&quot;
                formschema.newpassword.show = !formschema.newpassword.show
              &quot;
              required
            &gt;&lt;/v-text-field&gt;
            &lt;v-text-field
              autocomplete=&quot;off&quot;
              v-model=&quot;model.comfirmpassword&quot;
              :label=&quot;formschema.comfirmpassword.label&quot;
              :rules=&quot;[rules.required, rules.min]&quot;
              :append-icon=&quot;
                formschema.comfirmpassword.show ? 'mdi-eye' : 'mdi-eye-off'
              &quot;
              @click:append=&quot;
                formschema.comfirmpassword.show = !formschema.comfirmpassword.show
              &quot;
              :type=&quot;formschema.comfirmpassword.show ? 'text' : 'password'&quot;
              required
            &gt;&lt;/v-text-field&gt;
          &lt;/v-form&gt;
  </code></pre>
  <p>when i close it (the form is in an dialog),i clean the data,
  but when i reopen it ,it will return errrors:</p>
  <pre><code>&quot;TypeError: Cannot read property 'length' of null&quot;
  </code></pre>
  <p>please help me .how can i reset the form data but not get the error ?</p>
  <p>i clean my form just let the model bind to form's items = default model.
  such as:</p>
  <pre><code>this.model = this.defaultmodel
  </code></pre>