[FIX] web: Form: protect against widget destruction

When a button is clicked in a form view, the event 'execute_action'
is triggered up and catched by the view_manager, which can do
various async stuff. Meanwhile, the form view might be destroyed,
and in this case, the handlers shouldn't be executed when the
async stuff is done.

addons/web/static/src/js/views/form/form_controller.js

@@ -266,6 +266,11 @@ var FormController = BasicController.extend({
     _callButtonAction: function (attrs, record) {
         var self = this;
         var def = $.Deferred();
+        var reload = function () {
+            if (!self.isDestroyed()) {
+                self.reload();
+            }
+        };
         record = record || this.model.get(this.handle);
         var recordID = record.data.id;
         this.trigger_up('execute_action', {
@@ -276,13 +281,13 @@ var FormController = BasicController.extend({
             record_id: recordID,
             on_closed: function (reason) {
                 if (!_.isObject(reason)) {
-                    return self.reload();
+                    reload();
                 }
             },
-            on_fail: this.reload.bind(this),
+            on_fail: reload,
             on_success: def.resolve.bind(def),
         });
-        return def;
+        return this.alive(def);
     },
     /**
      * @override method from FieldManagerMixin

addons/web/static/test/views/form_tests.js

@@ -2161,6 +2161,27 @@ QUnit.module('Views', {
         }
     });
 
+    QUnit.test('rpc complete after destroying parent', function (assert) {
+        // We just test that there is no crash in this situation
+        assert.expect(0);
+        var form = createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch: '<form>' +
+                    '<button name="update_module" type="object" class="o_form_button_update"/>' +
+                '</form>',
+            res_id: 2,
+            intercepts: {
+                execute_action: function (event) {
+                    form.destroy();
+                    event.data.on_success();
+                }
+            }
+        });
+        form.$('.o_form_button_update').click();
+    });
+
     QUnit.test('onchanges that complete after discarding', function (assert) {
         assert.expect(4);