t-else with t-widget

[alexkuhn]

const {Component, QWeb} = owl.core;

class Child extends Component {
    constructor() {
        super(...arguments);
        this.template = "child"
    }
}

class App extends Component {
  constructor() {
    super(...arguments);
    this.template = "app";
    this.widgets = { Child };
  }
}

const qweb = new QWeb(TEMPLATES);
const app = new App({qweb});
app.mount(document.body);

<templates>
  <div t-name="app">
    <div t-if="0"/>
    <t t-else="" t-widget="Child" t-props="{ test: 0 }"/>
  </div>
  
  <div t-name="child">
      <t t-esc="props.test"/>
  </div>
</templates>

Crashes with the following error:

Invalid generated code while compiling template 'app': Unexpected token )

[alexkuhn]

If we split t-else and t-widget, works fine:

<t t-else="">
   <t t-widget="Child" t-props="{ test: 0 }"/>
</t>

[ged-odoo]

it is because you use the t-else with a falsy value. If you write <t t-else="1" t-widget="Child" t-props="{ test: 0 }"/>, it will work