[FIX] web: onchange with domain should not crash if field is not in view

In some cases (onchange in a purchase order), the onchange can return a
domain for a field that is not in view.  It should not be the case, but
it is really simple to protect the web client anyway.

addons/web/static/src/js/views/basic/basic_model.js

@@ -2996,7 +2996,9 @@ var BasicModel = AbstractModel.extend({
                 if (result.domain) {
                     var fieldsInfo = record.fieldsInfo[viewType || record.viewType];
                     for (var fieldName in result.domain) {
-                        fieldsInfo[fieldName].domain = result.domain[fieldName];
+                        if (fieldsInfo[fieldName]) {
+                            fieldsInfo[fieldName].domain = result.domain[fieldName];
+                        }
                     }
                 }
                 return self._applyOnChange(result.value, record).then(function () {

addons/web/static/tests/fields/relational_fields_tests.js

@@ -1273,6 +1273,7 @@ QUnit.module('relational_fields', {
                     return $.when({
                         domain: {
                             trululu: domain,
+                            unexisting_field: domain,
                         }
                     });
                 }