[IMP] mail: guard MediaPreviewComponent

Task-2797754

closes odoo/odoo#86827

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

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

@@ -2,8 +2,8 @@
 <templates xml:space="preserve">
 
     <t t-name="mail.MediaPreview" owl="1">
-        <div class="o_MediaPreview position-relative d-flex justify-content-center" t-attf-class="{{ className }}" t-ref="root">
-            <t t-if="mediaPreview">
+        <t t-if="mediaPreview">
+            <div class="o_MediaPreview position-relative d-flex justify-content-center" t-attf-class="{{ className }}" t-ref="root">
                 <video class="o_MediaPreview_videoDisplay shadow rounded bg-dark" height="480" width="640" autoplay="" t-ref="video"/>
                 <p t-if="mediaPreview.doesBrowserSupportMediaDevices and !mediaPreview.isVideoEnabled" class="o_MediaPreview_mediaDevicesStatus position-absolute text-light">
                     Camera is off
@@ -18,8 +18,8 @@
                     <button t-if="mediaPreview.isVideoEnabled" class="o_MediaPreview_disableVideoButton o_MediaPreview_button btn btn-dark btn-lg p-0 m-3 rounded-circle border-light fa fa-video-camera" t-on-click="mediaPreview.onClickDisableVideoButton"/>
                 </div>
                 <audio class="o_MediaPreview_audioPlayer" autoplay="" t-ref="audio"/>
-            </t>
-        </div>
+            </div>
+        </t>
     </t>
 
 </templates>