[IMP] component: allow dynamic root nodes

closes #283

tests/router/__snapshots__/Link.test.ts.snap

@@ -5,11 +5,13 @@ exports[`Link component can render simple cases 1`] = `
 ) {
     let utils = this.constructor.utils;
     let owner = context;
+    let result;
     var h = this.h;
     let _1 = utils.toObj({'router-link-active':context['isActive']});
     var _2 = context['href'];
     let c3 = [], p3 = {key:3,attrs:{href: _2},class:_1,on:{}};
     var vn3 = h('a', p3, c3);
+    result = vn3;
     if (!context['navigate']) {
         throw new Error('Missing handler \\\\'' + 'navigate' + \`\\\\' when evaluating template '__owl__-router-link'\`)
     }
@@ -19,6 +21,6 @@ exports[`Link component can render simple cases 1`] = `
     if (slot4) {
         slot4.call(this, context.__owl__.parent, Object.assign({}, extra, {parentNode: c3, vars: extra.vars, parent: owner}));
     }
-    return vn3;
+    return result;
 }"
 `;

tests/router/__snapshots__/directive.test.ts.snap

@@ -7,9 +7,11 @@ exports[`router directive t-routecomponent can render parameterized route 1`] =
     let QWeb = this.constructor;
     let parent = context;
     let owner = context;
+    let result;
     var h = this.h;
     let c1 = [], p1 = {key:1};
     var vn1 = h('div', p1, c1);
+    result = vn1;
     if (context['env'].router.currentRouteName==='book') {
         //COMPONENT
         let def3;
@@ -39,7 +41,7 @@ exports[`router directive t-routecomponent can render parameterized route 1`] =
         }
         extra.promises.push(def3);
     }
-    return vn1;
+    return result;
 }"
 `;
 
@@ -50,9 +52,11 @@ exports[`router directive t-routecomponent can render parameterized route with s
     let QWeb = this.constructor;
     let parent = context;
     let owner = context;
+    let result;
     var h = this.h;
     let c1 = [], p1 = {key:1};
     var vn1 = h('div', p1, c1);
+    result = vn1;
     if (context['env'].router.currentRouteName==='book') {
         //COMPONENT
         let def3;
@@ -82,7 +86,7 @@ exports[`router directive t-routecomponent can render parameterized route with s
         }
         extra.promises.push(def3);
     }
-    return vn1;
+    return result;
 }"
 `;
 
@@ -93,9 +97,11 @@ exports[`router directive t-routecomponent can render simple cases 1`] = `
     let QWeb = this.constructor;
     let parent = context;
     let owner = context;
+    let result;
     var h = this.h;
     let c1 = [], p1 = {key:1};
     var vn1 = h('div', p1, c1);
+    result = vn1;
     if (context['env'].router.currentRouteName==='about') {
         //COMPONENT
         let def3;
@@ -154,6 +160,6 @@ exports[`router directive t-routecomponent can render simple cases 1`] = `
         }
         extra.promises.push(def6);
     }
-    return vn1;
+    return result;
 }"
 `;