Проверка мультиполя на заполненность

<div class="col-md-6 col-sm-12">
            <label for="languages">Languages</label>
            <select multiple class="selectpicker form-control" id="languages" name="languages[]" data-live-search="true">
                <option>English</option>
                <option>French</option>
                <option>Italian</option>
                <option>Spain</option>
                <option>Russian</option>
            </select>
            <span class="error"></span>
        </div>

[[!TicketForm?
&allowedFields=`profile-status,name,gender,languages`
&tplFormCreate=`tickets.form.create.tpl`
&tplFormUpdate=`tickets.form.update.tpl`
&redirectUnpublished=`11`
&redirectDeleted=`11`
&tplTicketEmailBcc=`tpl.Tickets.ticket.email.bcc`
&customValidators=`imageCountValidator`
&validate=`
                            gender:required,
                            languages:required[],
                            files:imageCountValidator`
                    ]]