address: add check for empty value

src/inputs-ext/address/address.js

@@ -111,6 +111,7 @@ $(function(){
         @param {mixed} value
        **/         
        value2input: function(value) {
+           if(!value) return;
            this.$input.filter('[name="city"]').val(value.city);
            this.$input.filter('[name="street"]').val(value.street);
            this.$input.filter('[name="building"]').val(value.building);