[FIX] qweb: add better support for template with only strings

tests/__snapshots__/qweb.test.ts.snap

@@ -726,6 +726,18 @@ exports[`static templates empty div 1`] = `
 }"
 `;
 
+exports[`static templates simple dynamic value 1`] = `
+"function anonymous(context,extra
+) {
+    var h = this.utils.h;
+    var _1 = context['text'];
+    if (_1 || _1 === 0) {
+        var vn2 = {text: _1};
+    }
+    return vn2;
+}"
+`;
+
 exports[`static templates simple string 1`] = `
 "function anonymous(context,extra
 ) {
@@ -735,6 +747,19 @@ exports[`static templates simple string 1`] = `
 }"
 `;
 
+exports[`static templates simple string, with some dynamic value 1`] = `
+"function anonymous(context,extra
+) {
+    var h = this.utils.h;
+    var vn1 = {text: \`hello \`};
+    var _2 = context['text'];
+    if (_2 || _2 === 0) {
+        vn1.text += _2;
+    }
+    return vn1;
+}"
+`;
+
 exports[`t-call (template calling basic caller 1`] = `
 "function anonymous(context,extra
 ) {

tests/qweb.test.ts

@@ -24,6 +24,16 @@ describe("static templates", () => {
     expect(renderToString(qweb, "test")).toBe("hello vdom");
   });
 
+  test("simple dynamic value", () => {
+    qweb.addTemplate("test", "<t><t t-esc=\"text\"/></t>");
+    expect(renderToString(qweb, "test", {text: "hello vdom"})).toBe("hello vdom");
+  });
+
+  test("simple string, with some dynamic value", () => {
+    qweb.addTemplate("test", "<t>hello <t t-esc=\"text\"/></t>");
+    expect(renderToString(qweb, "test", {text: "vdom"})).toBe("hello vdom");
+  });
+
   test("empty div", () => {
     qweb.addTemplate("test", "<div></div>");
     expect(renderToString(qweb, "test")).toBe("<div></div>");