[FIX] *: remove useless values to t-else and t-debug

The actual value does not matter, only the fact that it is present.

closes #564

doc/reference/component.md

@@ -946,7 +946,7 @@ For example, here is how we could implement an `ErrorBoundary` component:
     <t t-if="state.error">
         Error handled
     </t>
-    <t t-else="1">
+    <t t-else="">
         <t t-slot="default" />
     </t>
 </div>

doc/reference/context.md

@@ -57,7 +57,7 @@ class SomeComponent extends Component {
       <t t-if=device.isMobile>
           some simplified user interface
       </t>
-      <t t-else="1">
+      <t t-else="">
           a more advanced user interface
       </t>
     </div>`;

doc/reference/qweb_templating_language.md

@@ -28,7 +28,7 @@ generate a virtual dom representation of the HTML.
 ```xml
 <div>
     <span t-if="somecondition">Some string</span>
-    <ul t-else="1">
+    <ul t-else="">
         <li t-foreach="messages" t-as="message">
             <t t-esc="message"/>
         </li>
@@ -101,7 +101,7 @@ precisely, the result of a template rendering should have a single root node:
 <!–– ok: result has one single root node ––>
 <t>
     <div t-if="someCondition">foo</div>
-    <span t-else="1">bar</span>
+    <span t-else="">bar</span>
 </t>
 ```