[IMP] qweb: add default template in QWeb

tests/component.test.ts

@@ -29,7 +29,6 @@ beforeEach(() => {
   );
   env.qweb.addTemplate("widgetA", `<div>Hello<t t-widget="b"/></div>`);
   env.qweb.addTemplate("widgetB", `<div>world</div>`);
-  env.qweb.addTemplate("default", "<div/>");
 });
 
 afterEach(() => {

tests/qweb.test.ts

@@ -1024,7 +1024,7 @@ describe("loading templates", () => {
   test("does not crash if string does not have templates", () => {
     const data = "";
     qweb.loadTemplates(data);
-    expect(qweb.templates).toEqual({});
+    expect(Object.keys(qweb.templates)).toEqual(["default"]);
   });
 });