[IMP] mail: guard ChatWindowHeaderComponent

Task-2797754

closes odoo/odoo#86782

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/components/chat_window_header/chat_window_header.xml

@@ -2,8 +2,8 @@
 <templates xml:space="preserve">
 
     <t t-name="mail.ChatWindowHeader" owl="1">
-        <div class="o_ChatWindowHeader" t-att-class="{ 'o-mobile': messaging and messaging.device.isMobile }" t-attf-class="{{ className }}" t-on-click="_onClick" t-ref="root">
-            <t t-if="chatWindow">
+        <t t-if="chatWindow">
+            <div class="o_ChatWindowHeader" t-att-class="{ 'o-mobile': messaging.device.isMobile }" t-attf-class="{{ className }}" t-on-click="_onClick" t-ref="root">
                 <t t-if="props.hasCloseAsBackButton">
                     <div class="o_ChatWindowHeader_command o_ChatWindowHeader_commandBack o_ChatWindowHeader_commandClose" t-att-class="{ 'o-mobile': messaging.device.isMobile }" t-on-click="_onClickClose" title="Close conversation">
                         <i class="fa fa-arrow-left"/>
@@ -78,8 +78,8 @@
                         </div>
                     </t>
                 </div>
-            </t>
-        </div>
+            </div>
+        </t>
     </t>
 
 </templates>