[FIX] web: allow strings as m2o values in domain selector

Since the new views, the field parsing for m2o returns an object with
id and display_name. If the given value to parse is a string, it is
supposed that this is an ID. This was breaking the domain selector
widget which should allow strings as name-strings of m2o values.

addons/web/static/src/js/widgets/domain_selector.js

@@ -805,7 +805,7 @@ var DomainLeaf = DomainNode.extend({
             if (_.isBoolean(this.value)) {
                 this.value = "";
             } else if (_.isObject(this.value) && !_.isArray(this.value)) { // Can be object if parsed to x2x representation
-                this.value = this.value.id || "";
+                this.value = this.value.id || value || "";
             }
         }
 

addons/web/static/tests/widgets/domain_selector_tests.js

@@ -174,6 +174,26 @@ QUnit.module('DomainSelector', {
 
         domainSelector.destroy();
     });
+
+    QUnit.test("building a domain with a m2o without following the relation", function (assert) {
+        assert.expect(1);
+
+        var $target = $("#qunit-fixture");
+
+        // Create the domain selector and its mock environment
+        var domainSelector = new DomainSelector(null, "partner", [["product_id", "ilike", 1]], {
+            debugMode: true,
+            readonly: false,
+        });
+        testUtils.addMockEnvironment(domainSelector, {data: this.data});
+        domainSelector.appendTo($target);
+
+        domainSelector.$('.o_domain_leaf_value_input').val('pad').trigger('input').trigger('change');
+        assert.strictEqual(domainSelector.$('.o_domain_debug_input').val(), '[["product_id","ilike","pad"]]',
+            "string should have been allowed as m2o value");
+
+        domainSelector.destroy();
+    });
 });
 });
 });